diff --git a/dlls/msi/tests/automation.c b/dlls/msi/tests/automation.c
index 874c9aa813..e74acf140e 100644
--- a/dlls/msi/tests/automation.c
+++ b/dlls/msi/tests/automation.c
@@ -32,6 +32,9 @@
 
 #include "wine/test.h"
 
+static LONG (WINAPI *pRegDeleteKeyExA)(HKEY, LPCSTR, REGSAM, DWORD);
+static BOOL (WINAPI *pIsWow64Process)(HANDLE, PBOOL);
+
 DEFINE_GUID(GUID_NULL,0,0,0,0,0,0,0,0,0,0,0);
 
 static const char *msifile = "winetest-automation.msi";
@@ -199,6 +202,29 @@ static const msi_summary_info summary_info[] =
     ADD_INFO_FILETIME(PID_LASTPRINTED, &systemtime)
 };
 
+static void init_functionpointers(void)
+{
+    HMODULE hadvapi32 = GetModuleHandleA("advapi32.dll");
+    HMODULE hkernel32 = GetModuleHandleA("kernel32.dll");
+
+#define GET_PROC(dll, func) \
+    p ## func = (void *)GetProcAddress(dll, #func); \
+    if(!p ## func) \
+      trace("GetProcAddress(%s) failed\n", #func);
+
+    GET_PROC(hadvapi32, RegDeleteKeyExA)
+    GET_PROC(hkernel32, IsWow64Process)
+
+#undef GET_PROC
+}
+
+static LONG delete_key_portable( HKEY key, LPCSTR subkey, REGSAM access )
+{
+    if (pRegDeleteKeyExA)
+        return pRegDeleteKeyExA( key, subkey, access, 0 );
+    return RegDeleteKeyA( key, subkey );
+}
+
 /*
  * Database Helpers
  */
@@ -2334,30 +2360,30 @@ static void test_Installer_Products(BOOL bProductInstalled)
 
 /* Delete a registry subkey, including all its subkeys (RegDeleteKey does not work on keys with subkeys without
  * deleting the subkeys first) */
-static UINT delete_registry_key(HKEY hkeyParent, LPCSTR subkey)
+static UINT delete_registry_key(HKEY hkeyParent, LPCSTR subkey, REGSAM access)
 {
     UINT ret;
     CHAR *string = NULL;
     HKEY hkey;
     DWORD dwSize;
 
-    ret = RegOpenKey(hkeyParent, subkey, &hkey);
+    ret = RegOpenKeyEx(hkeyParent, subkey, 0, access, &hkey);
     if (ret != ERROR_SUCCESS) return ret;
     ret = RegQueryInfoKeyA(hkey, NULL, NULL, NULL, NULL, &dwSize, NULL, NULL, NULL, NULL, NULL, NULL);
     if (ret != ERROR_SUCCESS) return ret;
     if (!(string = HeapAlloc(GetProcessHeap(), 0, ++dwSize))) return ERROR_NOT_ENOUGH_MEMORY;
 
     while (RegEnumKeyA(hkey, 0, string, dwSize) == ERROR_SUCCESS)
-        delete_registry_key(hkey, string);
+        delete_registry_key(hkey, string, access);
 
     RegCloseKey(hkey);
     HeapFree(GetProcessHeap(), 0, string);
-    RegDeleteKeyA(hkeyParent, subkey);
+    delete_key_portable(hkeyParent, subkey, access);
     return ERROR_SUCCESS;
 }
 
 /* Find a specific registry subkey at any depth within the given key and subkey and return its parent key. */
-static UINT find_registry_key(HKEY hkeyParent, LPCSTR subkey, LPCSTR findkey, HKEY *phkey)
+static UINT find_registry_key(HKEY hkeyParent, LPCSTR subkey, LPCSTR findkey, REGSAM access, HKEY *phkey)
 {
     UINT ret;
     CHAR *string = NULL;
@@ -2368,7 +2394,7 @@ static UINT find_registry_key(HKEY hkeyParent, LPCSTR subkey, LPCSTR findkey, HK
 
     *phkey = 0;
 
-    ret = RegOpenKey(hkeyParent, subkey, &hkey);
+    ret = RegOpenKeyEx(hkeyParent, subkey, 0, access, &hkey);
     if (ret != ERROR_SUCCESS) return ret;
     ret = RegQueryInfoKeyA(hkey, NULL, NULL, NULL, NULL, &dwSize, NULL, NULL, NULL, NULL, NULL, NULL);
     if (ret != ERROR_SUCCESS) return ret;
@@ -2382,7 +2408,7 @@ static UINT find_registry_key(HKEY hkeyParent, LPCSTR subkey, LPCSTR findkey, HK
             *phkey = hkey;
             found = TRUE;
         }
-        else if (find_registry_key(hkey, string, findkey, phkey) == ERROR_SUCCESS) found = TRUE;
+        else if (find_registry_key(hkey, string, findkey, access, phkey) == ERROR_SUCCESS) found = TRUE;
     }
 
     if (*phkey != hkey) RegCloseKey(hkey);
@@ -2400,6 +2426,11 @@ static void test_Installer_InstallProduct(void)
     DWORD num, size, type;
     int iValue, iCount;
     IDispatch *pStringList = NULL;
+    REGSAM access = KEY_ALL_ACCESS;
+    BOOL wow64;
+
+    if (pIsWow64Process && pIsWow64Process(GetCurrentProcess(), &wow64) && wow64)
+        access |= KEY_WOW64_64KEY;
 
     create_test_files();
 
@@ -2483,7 +2514,7 @@ static void test_Installer_InstallProduct(void)
     ok(delete_pf("msitest\\filename", TRUE), "File not installed\n");
     ok(delete_pf("msitest", FALSE), "File not installed\n");
 
-    res = RegOpenKey(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest", &hkey);
+    res = RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest", 0, access, &hkey);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
     size = MAX_PATH;
@@ -2511,40 +2542,45 @@ static void test_Installer_InstallProduct(void)
 
     RegCloseKey(hkey);
 
-    res = RegDeleteKeyA(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest");
+    res = delete_key_portable(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest", access);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
     /* Remove registry keys written by RegisterProduct standard action */
-    res = RegDeleteKeyA(HKEY_LOCAL_MACHINE, "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall\\{F1C3AF50-8B56-4A69-A00C-00773FE42F30}");
+    res = delete_key_portable(HKEY_LOCAL_MACHINE,
+        "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall\\{F1C3AF50-8B56-4A69-A00C-00773FE42F30}", access);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
-    res = RegDeleteKeyA(HKEY_LOCAL_MACHINE, "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Installer\\UpgradeCodes\\D8E760ECA1E276347B43E42BDBDA5656");
+    res = delete_key_portable(HKEY_LOCAL_MACHINE,
+        "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Installer\\UpgradeCodes\\D8E760ECA1E276347B43E42BDBDA5656", access);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
-    res = find_registry_key(HKEY_LOCAL_MACHINE, "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Installer\\UserData", "05FA3C1F65B896A40AC00077F34EF203", &hkey);
+    res = find_registry_key(HKEY_LOCAL_MACHINE,
+        "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Installer\\UserData", "05FA3C1F65B896A40AC00077F34EF203", access, &hkey);
     ok(res == ERROR_SUCCESS ||
        broken(res == ERROR_FILE_NOT_FOUND), /* win9x */
        "Expected ERROR_SUCCESS, got %d\n", res);
     if (res == ERROR_SUCCESS)
     {
-        res = delete_registry_key(hkey, "05FA3C1F65B896A40AC00077F34EF203");
+        res = delete_registry_key(hkey, "05FA3C1F65B896A40AC00077F34EF203", access);
         ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
         RegCloseKey(hkey);
 
-        res = RegDeleteKeyA(HKEY_LOCAL_MACHINE, "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Installer\\Products\\05FA3C1F65B896A40AC00077F34EF203");
+        res = delete_key_portable(HKEY_LOCAL_MACHINE,
+            "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Installer\\Products\\05FA3C1F65B896A40AC00077F34EF203", access);
         ok(res == ERROR_FILE_NOT_FOUND, "Expected ERROR_FILE_NOT_FOUND, got %d\n", res);
     }
     else
     {
         /* win9x defaults to a per-machine install. */
-        RegDeleteKeyA(HKEY_LOCAL_MACHINE, "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Installer\\Products\\05FA3C1F65B896A40AC00077F34EF203");
+        delete_key_portable(HKEY_LOCAL_MACHINE,
+            "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Installer\\Products\\05FA3C1F65B896A40AC00077F34EF203", access);
     }
 
     /* Remove registry keys written by PublishProduct standard action */
     res = RegOpenKey(HKEY_CURRENT_USER, "SOFTWARE\\Microsoft\\Installer", &hkey);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
-    res = delete_registry_key(hkey, "Products\\05FA3C1F65B896A40AC00077F34EF203");
+    res = delete_registry_key(hkey, "Products\\05FA3C1F65B896A40AC00077F34EF203", KEY_ALL_ACCESS);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
     res = RegDeleteKeyA(hkey, "UpgradeCodes\\D8E760ECA1E276347B43E42BDBDA5656");
@@ -2693,6 +2729,7 @@ START_TEST(automation)
     CLSID clsid;
     IUnknown *pUnk;
 
+    init_functionpointers();
     GetSystemTimeAsFileTime(&systemtime);
 
     GetCurrentDirectoryA(MAX_PATH, prev_path);
diff --git a/dlls/msi/tests/install.c b/dlls/msi/tests/install.c
index c5e26f5b69..1d27658222 100644
--- a/dlls/msi/tests/install.c
+++ b/dlls/msi/tests/install.c
@@ -44,6 +44,8 @@ static UINT (WINAPI *pMsiSourceListGetInfoA)
     (LPCSTR, LPCSTR, MSIINSTALLCONTEXT, DWORD, LPCSTR, LPSTR, LPDWORD);
 
 static BOOL (WINAPI *pConvertSidToStringSidA)(PSID, LPSTR*);
+static LONG (WINAPI *pRegDeleteKeyExA)(HKEY, LPCSTR, REGSAM, DWORD);
+static BOOL (WINAPI *pIsWow64Process)(HANDLE, PBOOL);
 
 static HMODULE hsrclient = 0;
 static BOOL (WINAPI *pSRRemoveRestorePoint)(DWORD);
@@ -3063,6 +3065,7 @@ static void init_functionpointers(void)
 {
     HMODULE hmsi = GetModuleHandleA("msi.dll");
     HMODULE hadvapi32 = GetModuleHandleA("advapi32.dll");
+    HMODULE hkernel32 = GetModuleHandleA("kernel32.dll");
 
 #define GET_PROC(mod, func) \
     p ## func = (void*)GetProcAddress(mod, #func); \
@@ -3075,6 +3078,8 @@ static void init_functionpointers(void)
     GET_PROC(hmsi, MsiSourceListGetInfoA);
 
     GET_PROC(hadvapi32, ConvertSidToStringSidA);
+    GET_PROC(hadvapi32, RegDeleteKeyExA)
+    GET_PROC(hkernel32, IsWow64Process)
 
     hsrclient = LoadLibraryA("srclient.dll");
     GET_PROC(hsrclient, SRRemoveRestorePoint);
@@ -3484,6 +3489,13 @@ static void remove_restore_point(DWORD seq_number)
         trace("Failed to remove the restore point : %08x\n", res);
 }
 
+static LONG delete_key( HKEY key, LPCSTR subkey, REGSAM access )
+{
+    if (pRegDeleteKeyExA)
+        return pRegDeleteKeyExA( key, subkey, access, 0 );
+    return RegDeleteKeyA( key, subkey );
+}
+
 static void test_MsiInstallProduct(void)
 {
     UINT r;
@@ -3491,6 +3503,8 @@ static void test_MsiInstallProduct(void)
     LONG res;
     HKEY hkey;
     DWORD num, size, type;
+    REGSAM access = KEY_ALL_ACCESS;
+    BOOL wow64;
 
     if (on_win9x)
     {
@@ -3498,6 +3512,9 @@ static void test_MsiInstallProduct(void)
         return;
     }
 
+    if (pIsWow64Process && pIsWow64Process(GetCurrentProcess(), &wow64) && wow64)
+        access |= KEY_WOW64_64KEY;
+
     /* szPackagePath is NULL */
     r = MsiInstallProductA(NULL, "INSTALL=ALL");
     ok(r == ERROR_INVALID_PARAMETER,
@@ -3538,7 +3555,7 @@ static void test_MsiInstallProduct(void)
     ok(delete_pf("msitest\\service.exe", TRUE), "File not installed\n");
     ok(delete_pf("msitest", FALSE), "File not installed\n");
 
-    res = RegOpenKey(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest", &hkey);
+    res = RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest", 0, access, &hkey);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
     size = MAX_PATH;
@@ -3566,7 +3583,7 @@ static void test_MsiInstallProduct(void)
 
     check_service_is_installed();
 
-    RegDeleteKeyA(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest");
+    delete_key(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest", access);
 
     /* not published, reinstall */
     r = MsiInstallProductA(msifile, NULL);
@@ -3585,9 +3602,9 @@ static void test_MsiInstallProduct(void)
     ok(delete_pf("msitest\\service.exe", TRUE), "File not installed\n");
     ok(delete_pf("msitest", FALSE), "File not installed\n");
 
-    res = RegOpenKey(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest", &hkey);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest", 0, access, &hkey);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
-    RegDeleteKeyA(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest");
+    delete_key(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest", access);
 
     create_database(msifile, up_tables, sizeof(up_tables) / sizeof(msi_table));
 
@@ -3608,9 +3625,9 @@ static void test_MsiInstallProduct(void)
     ok(delete_pf("msitest\\service.exe", TRUE), "File not installed\n");
     ok(delete_pf("msitest", FALSE), "File not installed\n");
 
-    res = RegOpenKey(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest", &hkey);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest", 0, access, &hkey);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
-    RegDeleteKeyA(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest");
+    delete_key(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest", access);
 
     create_database(msifile, up2_tables, sizeof(up2_tables) / sizeof(msi_table));
 
@@ -3631,9 +3648,9 @@ static void test_MsiInstallProduct(void)
     ok(delete_pf("msitest\\service.exe", TRUE), "File not installed\n");
     ok(delete_pf("msitest", FALSE), "File not installed\n");
 
-    res = RegOpenKey(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest", &hkey);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest", 0, access, &hkey);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
-    RegDeleteKeyA(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest");
+    delete_key(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest", access);
 
     create_database(msifile, up3_tables, sizeof(up3_tables) / sizeof(msi_table));
 
@@ -3654,9 +3671,9 @@ static void test_MsiInstallProduct(void)
     ok(delete_pf("msitest\\service.exe", TRUE), "File not installed\n");
     ok(delete_pf("msitest", FALSE), "File not installed\n");
 
-    res = RegOpenKey(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest", &hkey);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest", 0, access, &hkey);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
-    RegDeleteKeyA(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest");
+    delete_key(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest", access);
 
     create_database(msifile, up4_tables, sizeof(up4_tables) / sizeof(msi_table));
 
@@ -3677,7 +3694,7 @@ static void test_MsiInstallProduct(void)
     ok(delete_pf("msitest\\service.exe", TRUE), "File not installed\n");
     ok(delete_pf("msitest", FALSE), "File not installed\n");
 
-    res = RegOpenKey(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest", &hkey);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest", 0, access, &hkey);
     ok(res == ERROR_FILE_NOT_FOUND, "Expected ERROR_FILE_NOT_FOUND, got %d\n", res);
 
     create_database(msifile, up4_tables, sizeof(up4_tables) / sizeof(msi_table));
@@ -3699,7 +3716,7 @@ static void test_MsiInstallProduct(void)
     ok(delete_pf("msitest\\service.exe", TRUE), "File not installed\n");
     ok(delete_pf("msitest", FALSE), "File not installed\n");
 
-    res = RegOpenKey(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest", &hkey);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest", 0, access, &hkey);
     ok(res == ERROR_FILE_NOT_FOUND, "Expected ERROR_FILE_NOT_FOUND, got %d\n", res);
 
     create_database(msifile, up5_tables, sizeof(up5_tables) / sizeof(msi_table));
@@ -3721,7 +3738,7 @@ static void test_MsiInstallProduct(void)
     ok(delete_pf("msitest\\service.exe", TRUE), "File not installed\n");
     ok(delete_pf("msitest", FALSE), "File not installed\n");
 
-    res = RegOpenKey(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest", &hkey);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest", 0, access, &hkey);
     ok(res == ERROR_FILE_NOT_FOUND, "Expected ERROR_FILE_NOT_FOUND, got %d\n", res);
 
     create_database(msifile, up6_tables, sizeof(up6_tables) / sizeof(msi_table));
@@ -3743,7 +3760,7 @@ static void test_MsiInstallProduct(void)
     ok(delete_pf("msitest\\service.exe", TRUE), "File not installed\n");
     ok(delete_pf("msitest", FALSE), "File not installed\n");
 
-    res = RegOpenKey(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest", &hkey);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest", 0, access, &hkey);
     ok(res == ERROR_FILE_NOT_FOUND, "Expected ERROR_FILE_NOT_FOUND, got %d\n", res);
 
     create_database(msifile, up7_tables, sizeof(up7_tables) / sizeof(msi_table));
@@ -3765,7 +3782,7 @@ static void test_MsiInstallProduct(void)
     ok(delete_pf("msitest\\service.exe", TRUE), "File not installed\n");
     ok(delete_pf("msitest", FALSE), "File not installed\n");
 
-    res = RegOpenKey(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest", &hkey);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest", 0, access, &hkey);
     ok(res == ERROR_FILE_NOT_FOUND, "Expected ERROR_FILE_NOT_FOUND, got %d\n", res);
 
     r = MsiInstallProductA(msifile, "REMOVE=ALL");
@@ -4766,6 +4783,8 @@ static void test_publish_registerproduct(void)
     char date[MAX_PATH];
     char temp[MAX_PATH];
     char keypath[MAX_PATH];
+    REGSAM access = KEY_ALL_ACCESS;
+    BOOL wow64;
 
     static const CHAR uninstall[] = "Software\\Microsoft\\Windows\\CurrentVersion"
                                     "\\Uninstall\\{7DF88A48-996F-4EC8-A022-BF956F9B2CBB}";
@@ -4787,6 +4806,9 @@ static void test_publish_registerproduct(void)
 
     create_database(msifile, pp_tables, sizeof(pp_tables) / sizeof(msi_table));
 
+    if (pIsWow64Process && pIsWow64Process(GetCurrentProcess(), &wow64) && wow64)
+        access |= KEY_WOW64_64KEY;
+
     MsiSetInternalUI(INSTALLUILEVEL_FULL, NULL);
 
     /* RegisterProduct */
@@ -4803,7 +4825,7 @@ static void test_publish_registerproduct(void)
     res = RegOpenKeyA(HKEY_CURRENT_USER, userugkey, &hkey);
     ok(res == ERROR_FILE_NOT_FOUND, "Expected ERROR_FILE_NOT_FOUND, got %d\n", res);
 
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, uninstall, &hkey);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, uninstall, 0, access, &hkey);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
     CHECK_DEL_REG_STR(hkey, "DisplayName", "MSITEST");
@@ -4833,14 +4855,14 @@ static void test_publish_registerproduct(void)
         CHECK_DEL_REG_DWORD3(hkey, "EstimatedSize", 12, -12, 4);
     }
 
-    RegDeleteKeyA(hkey, "");
+    delete_key(hkey, "", access);
     RegCloseKey(hkey);
 
     sprintf(keypath, userdata, usersid);
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, keypath, &hkey);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, keypath, 0, access, &hkey);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
-    res = RegOpenKeyA(hkey, "InstallProperties", &props);
+    res = RegOpenKeyExA(hkey, "InstallProperties", 0, access, &props);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
     RegDeleteValueA(props, "LocalPackage"); /* LocalPackage is nondeterministic */
@@ -4871,26 +4893,26 @@ static void test_publish_registerproduct(void)
         CHECK_DEL_REG_DWORD3(props, "EstimatedSize", 12, -12, 4);
     }
 
-    RegDeleteKeyA(props, "");
+    delete_key(props, "", access);
     RegCloseKey(props);
 
-    res = RegOpenKeyA(hkey, "Usage", &usage);
+    res = RegOpenKeyExA(hkey, "Usage", 0, access, &usage);
     todo_wine
     {
         ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
     }
 
-    RegDeleteKeyA(usage, "");
+    delete_key(usage, "", access);
     RegCloseKey(usage);
-    RegDeleteKeyA(hkey, "");
+    delete_key(hkey, "", access);
     RegCloseKey(hkey);
 
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, ugkey, &hkey);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, ugkey, 0, access, &hkey);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
     CHECK_DEL_REG_STR(hkey, "84A88FD7F6998CE40A22FB59F6B9C2BB", NULL);
 
-    RegDeleteKeyA(hkey, "");
+    delete_key(hkey, "", access);
     RegCloseKey(hkey);
 
     /* RegisterProduct, machine */
@@ -4899,10 +4921,10 @@ static void test_publish_registerproduct(void)
     ok(delete_pf("msitest\\maximus", TRUE), "File not installed\n");
     ok(delete_pf("msitest", FALSE), "File not installed\n");
 
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, userugkey, &hkey);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, userugkey, 0, access, &hkey);
     ok(res == ERROR_FILE_NOT_FOUND, "Expected ERROR_FILE_NOT_FOUND, got %d\n", res);
 
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, uninstall, &hkey);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, uninstall, 0, access, &hkey);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
     CHECK_DEL_REG_STR(hkey, "DisplayName", "MSITEST");
@@ -4932,14 +4954,14 @@ static void test_publish_registerproduct(void)
         CHECK_DEL_REG_DWORD3(hkey, "EstimatedSize", 12, -12, 4);
     }
 
-    RegDeleteKeyA(hkey, "");
+    delete_key(hkey, "", access);
     RegCloseKey(hkey);
 
     sprintf(keypath, userdata, "S-1-5-18");
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, keypath, &hkey);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, keypath, 0, access, &hkey);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
-    res = RegOpenKeyA(hkey, "InstallProperties", &props);
+    res = RegOpenKeyExA(hkey, "InstallProperties", 0, access, &props);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
     RegDeleteValueA(props, "LocalPackage"); /* LocalPackage is nondeterministic */
@@ -4970,26 +4992,26 @@ static void test_publish_registerproduct(void)
         CHECK_DEL_REG_DWORD3(props, "EstimatedSize", 12, -12, 4);
     }
 
-    RegDeleteKeyA(props, "");
+    delete_key(props, "", access);
     RegCloseKey(props);
 
-    res = RegOpenKeyA(hkey, "Usage", &usage);
+    res = RegOpenKeyExA(hkey, "Usage", 0, access, &usage);
     todo_wine
     {
         ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
     }
 
-    RegDeleteKeyA(usage, "");
+    delete_key(usage, "", access);
     RegCloseKey(usage);
-    RegDeleteKeyA(hkey, "");
+    delete_key(hkey, "", access);
     RegCloseKey(hkey);
 
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, ugkey, &hkey);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, ugkey, 0, access, &hkey);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
     CHECK_DEL_REG_STR(hkey, "84A88FD7F6998CE40A22FB59F6B9C2BB", NULL);
 
-    RegDeleteKeyA(hkey, "");
+    delete_key(hkey, "", access);
     RegCloseKey(hkey);
 
 error:
@@ -5009,7 +5031,8 @@ static void test_publish_publishproduct(void)
     CHAR keypath[MAX_PATH];
     CHAR temp[MAX_PATH];
     CHAR path[MAX_PATH];
-    BOOL old_installer = FALSE;
+    BOOL wow64, old_installer = FALSE;
+    REGSAM access = KEY_ALL_ACCESS;
 
     static const CHAR prodpath[] = "Software\\Microsoft\\Windows\\CurrentVersion"
                                    "\\Installer\\UserData\\%s\\Products"
@@ -5034,6 +5057,9 @@ static void test_publish_publishproduct(void)
 
     create_database(msifile, pp_tables, sizeof(pp_tables) / sizeof(msi_table));
 
+    if (pIsWow64Process && pIsWow64Process(GetCurrentProcess(), &wow64) && wow64)
+        access |= KEY_WOW64_64KEY;
+
     MsiSetInternalUI(INSTALLUILEVEL_FULL, NULL);
 
     /* PublishProduct, current user */
@@ -5047,11 +5073,11 @@ static void test_publish_publishproduct(void)
     ok(delete_pf("msitest\\maximus", TRUE), "File not installed\n");
     ok(delete_pf("msitest", FALSE), "File not installed\n");
 
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, badprod, &hkey);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, badprod, 0, access, &hkey);
     ok(res == ERROR_FILE_NOT_FOUND, "Expected ERROR_FILE_NOT_FOUND, got %d\n", res);
 
     sprintf(keypath, prodpath, usersid);
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, keypath, &hkey);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, keypath, 0, access, &hkey);
     if (res == ERROR_FILE_NOT_FOUND)
     {
         res = RegOpenKeyA(HKEY_CURRENT_USER, cuprodpath, &hkey);
@@ -5070,20 +5096,19 @@ static void test_publish_publishproduct(void)
     }
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
-    res = RegOpenKeyA(hkey, "InstallProperties", &props);
+    res = RegOpenKeyExA(hkey, "InstallProperties", 0, access, &props);
     ok(res == ERROR_FILE_NOT_FOUND, "Expected ERROR_FILE_NOT_FOUND, got %d\n", res);
 
-    res = RegOpenKeyA(hkey, "Patches", &patches);
+    res = RegOpenKeyExA(hkey, "Patches", 0, access, &patches);
     todo_wine
     {
         ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
-
         CHECK_DEL_REG_STR(patches, "AllPatches", NULL);
     }
 
-    RegDeleteKeyA(patches, "");
+    delete_key(patches, "", access);
     RegCloseKey(patches);
-    RegDeleteKeyA(hkey, "");
+    delete_key(hkey, "", access);
     RegCloseKey(hkey);
 
 currentuser:
@@ -5145,27 +5170,26 @@ currentuser:
     ok(delete_pf("msitest\\maximus", TRUE), "File not installed\n");
     ok(delete_pf("msitest", FALSE), "File not installed\n");
 
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, badprod, &hkey);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, badprod, 0, access, &hkey);
     ok(res == ERROR_FILE_NOT_FOUND, "Expected ERROR_FILE_NOT_FOUND, got %d\n", res);
 
     sprintf(keypath, prodpath, "S-1-5-18");
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, keypath, &hkey);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, keypath, 0, access, &hkey);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
-    res = RegOpenKeyA(hkey, "InstallProperties", &props);
+    res = RegOpenKeyExA(hkey, "InstallProperties", 0, access, &props);
     ok(res == ERROR_FILE_NOT_FOUND, "Expected ERROR_FILE_NOT_FOUND, got %d\n", res);
 
-    res = RegOpenKeyA(hkey, "Patches", &patches);
+    res = RegOpenKeyExA(hkey, "Patches", 0, access, &patches);
     todo_wine
     {
         ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
-
         CHECK_DEL_REG_STR(patches, "AllPatches", NULL);
     }
 
-    RegDeleteKeyA(patches, "");
+    delete_key(patches, "", access);
     RegCloseKey(patches);
-    RegDeleteKeyA(hkey, "");
+    delete_key(hkey, "", access);
     RegCloseKey(hkey);
 
 machprod:
@@ -5233,6 +5257,8 @@ static void test_publish_publishfeatures(void)
     HKEY hkey;
     LPSTR usersid;
     CHAR keypath[MAX_PATH];
+    REGSAM access = KEY_ALL_ACCESS;
+    BOOL wow64;
 
     static const CHAR cupath[] = "Software\\Microsoft\\Installer\\Features"
                                  "\\84A88FD7F6998CE40A22FB59F6B9C2BB";
@@ -5252,6 +5278,9 @@ static void test_publish_publishfeatures(void)
 
     create_database(msifile, pp_tables, sizeof(pp_tables) / sizeof(msi_table));
 
+    if (pIsWow64Process && pIsWow64Process(GetCurrentProcess(), &wow64) && wow64)
+        access |= KEY_WOW64_64KEY;
+
     MsiSetInternalUI(INSTALLUILEVEL_FULL, NULL);
 
     /* PublishFeatures, current user */
@@ -5265,10 +5294,10 @@ static void test_publish_publishfeatures(void)
     ok(delete_pf("msitest\\maximus", TRUE), "File not installed\n");
     ok(delete_pf("msitest", FALSE), "File not installed\n");
 
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, featkey, &hkey);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, featkey, 0, access, &hkey);
     ok(res == ERROR_FILE_NOT_FOUND, "Expected ERROR_FILE_NOT_FOUND, got %d\n", res);
 
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, classfeat, &hkey);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, classfeat, 0, access, &hkey);
     ok(res == ERROR_FILE_NOT_FOUND, "Expected ERROR_FILE_NOT_FOUND, got %d\n", res);
 
     res = RegOpenKeyA(HKEY_CURRENT_USER, cupath, &hkey);
@@ -5300,7 +5329,7 @@ static void test_publish_publishfeatures(void)
     ok(delete_pf("msitest\\maximus", TRUE), "File not installed\n");
     ok(delete_pf("msitest", FALSE), "File not installed\n");
 
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, featkey, &hkey);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, featkey, 0, access, &hkey);
     ok(res == ERROR_FILE_NOT_FOUND, "Expected ERROR_FILE_NOT_FOUND, got %d\n", res);
 
     res = RegOpenKeyA(HKEY_CURRENT_USER, cupath, &hkey);
@@ -5358,9 +5387,14 @@ static void get_owner_company(LPSTR *owner, LPSTR *company)
 {
     LONG res;
     HKEY hkey;
+    REGSAM access = KEY_ALL_ACCESS;
+    BOOL wow64;
 
     *owner = *company = NULL;
 
+    if (pIsWow64Process && pIsWow64Process(GetCurrentProcess(), &wow64) && wow64)
+        access |= KEY_WOW64_64KEY;
+
     res = RegOpenKeyA(HKEY_CURRENT_USER,
                       "Software\\Microsoft\\MS Setup (ACME)\\User Info", &hkey);
     if (res == ERROR_SUCCESS)
@@ -5372,8 +5406,8 @@ static void get_owner_company(LPSTR *owner, LPSTR *company)
 
     if (!*owner || !*company)
     {
-        res = RegOpenKeyA(HKEY_LOCAL_MACHINE,
-                          "Software\\Microsoft\\Windows\\CurrentVersion", &hkey);
+        res = RegOpenKeyExA(HKEY_LOCAL_MACHINE,
+                            "Software\\Microsoft\\Windows\\CurrentVersion", 0, access, &hkey);
         if (res == ERROR_SUCCESS)
         {
             *owner = reg_get_val_str(hkey, "RegisteredOwner");
@@ -5384,8 +5418,8 @@ static void get_owner_company(LPSTR *owner, LPSTR *company)
 
     if (!*owner || !*company)
     {
-        res = RegOpenKeyA(HKEY_LOCAL_MACHINE,
-                          "Software\\Microsoft\\Windows NT\\CurrentVersion", &hkey);
+        res = RegOpenKeyExA(HKEY_LOCAL_MACHINE,
+                            "Software\\Microsoft\\Windows NT\\CurrentVersion", 0, access, &hkey);
         if (res == ERROR_SUCCESS)
         {
             *owner = reg_get_val_str(hkey, "RegisteredOwner");
@@ -5403,6 +5437,8 @@ static void test_publish_registeruser(void)
     LPSTR usersid;
     LPSTR owner, company;
     CHAR keypath[MAX_PATH];
+    REGSAM access = KEY_ALL_ACCESS;
+    BOOL wow64;
 
     static const CHAR keyfmt[] =
         "Software\\Microsoft\\Windows\\CurrentVersion\\Installer\\"
@@ -5418,6 +5454,9 @@ static void test_publish_registeruser(void)
 
     create_database(msifile, pp_tables, sizeof(pp_tables) / sizeof(msi_table));
 
+    if (pIsWow64Process && pIsWow64Process(GetCurrentProcess(), &wow64) && wow64)
+        access |= KEY_WOW64_64KEY;
+
     MsiSetInternalUI(INSTALLUILEVEL_FULL, NULL);
 
     /* RegisterUser, per-user */
@@ -5432,8 +5471,7 @@ static void test_publish_registeruser(void)
     ok(delete_pf("msitest", FALSE), "File not installed\n");
 
     sprintf(keypath, keyfmt, usersid);
-
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, keypath, &props);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, keypath, 0, access, &props);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
     CHECK_REG_STR(props, "ProductID", "none");
@@ -5443,7 +5481,7 @@ static void test_publish_registeruser(void)
     RegDeleteValueA(props, "ProductID");
     RegDeleteValueA(props, "RegCompany");
     RegDeleteValueA(props, "RegOwner");
-    RegDeleteKeyA(props, "");
+    delete_key(props, "", access);
     RegCloseKey(props);
 
     /* RegisterUser, machine */
@@ -5453,8 +5491,7 @@ static void test_publish_registeruser(void)
     ok(delete_pf("msitest", FALSE), "File not installed\n");
 
     sprintf(keypath, keyfmt, "S-1-5-18");
-
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, keypath, &props);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, keypath, 0, access, &props);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
     CHECK_REG_STR(props, "ProductID", "none");
@@ -5464,7 +5501,7 @@ static void test_publish_registeruser(void)
     RegDeleteValueA(props, "ProductID");
     RegDeleteValueA(props, "RegCompany");
     RegDeleteValueA(props, "RegOwner");
-    RegDeleteKeyA(props, "");
+    delete_key(props, "", access);
     RegCloseKey(props);
 
 error:
@@ -5487,6 +5524,8 @@ static void test_publish_processcomponents(void)
     CHAR val[MAX_PATH];
     CHAR keypath[MAX_PATH];
     CHAR program_files_maximus[MAX_PATH];
+    REGSAM access = KEY_ALL_ACCESS;
+    BOOL wow64;
 
     static const CHAR keyfmt[] =
         "Software\\Microsoft\\Windows\\CurrentVersion\\Installer\\"
@@ -5502,6 +5541,9 @@ static void test_publish_processcomponents(void)
 
     create_database(msifile, ppc_tables, sizeof(ppc_tables) / sizeof(msi_table));
 
+    if (pIsWow64Process && pIsWow64Process(GetCurrentProcess(), &wow64) && wow64)
+        access |= KEY_WOW64_64KEY;
+
     MsiSetInternalUI(INSTALLUILEVEL_FULL, NULL);
 
     /* ProcessComponents, per-user */
@@ -5516,8 +5558,7 @@ static void test_publish_processcomponents(void)
     ok(delete_pf("msitest", FALSE), "File not installed\n");
 
     sprintf(keypath, keyfmt, usersid, "CBABC2FDCCB35E749A8944D8C1C098B5");
-
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, keypath, &comp);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, keypath, 0, access, &comp);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
     size = MAX_PATH;
@@ -5531,16 +5572,15 @@ static void test_publish_processcomponents(void)
     ok(!lstrcmpiA(val, program_files_maximus),
        "Expected \"%s\", got \"%s\"\n", program_files_maximus, val);
 
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, compkey, &hkey);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, compkey, 0, access, &hkey);
     ok(res == ERROR_FILE_NOT_FOUND, "Expected ERROR_FILE_NOT_FOUND, got %d\n", res);
 
     RegDeleteValueA(comp, "84A88FD7F6998CE40A22FB59F6B9C2BB");
-    RegDeleteKeyA(comp, "");
+    delete_key(comp, "", access);
     RegCloseKey(comp);
 
     sprintf(keypath, keyfmt, usersid, "241C3DA58FECD0945B9687D408766058");
-
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, keypath, &comp);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, keypath, 0, access, &comp);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
     size = MAX_PATH;
@@ -5550,11 +5590,11 @@ static void test_publish_processcomponents(void)
     ok(!lstrcmpA(val, "01\\msitest\\augustus"),
        "Expected \"01\\msitest\\augustus\", got \"%s\"\n", val);
 
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, compkey, &hkey);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, compkey, 0, access, &hkey);
     ok(res == ERROR_FILE_NOT_FOUND, "Expected ERROR_FILE_NOT_FOUND, got %d\n", res);
 
     RegDeleteValueA(comp, "84A88FD7F6998CE40A22FB59F6B9C2BB");
-    RegDeleteKeyA(comp, "");
+    delete_key(comp, "", access);
     RegCloseKey(comp);
 
     /* ProcessComponents, machine */
@@ -5564,8 +5604,7 @@ static void test_publish_processcomponents(void)
     ok(delete_pf("msitest", FALSE), "File not installed\n");
 
     sprintf(keypath, keyfmt, "S-1-5-18", "CBABC2FDCCB35E749A8944D8C1C098B5");
-
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, keypath, &comp);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, keypath, 0, access, &comp);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
     size = MAX_PATH;
@@ -5575,16 +5614,15 @@ static void test_publish_processcomponents(void)
     ok(!lstrcmpiA(val, program_files_maximus),
        "Expected \"%s\", got \"%s\"\n", program_files_maximus, val);
 
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, compkey, &hkey);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, compkey, 0, access, &hkey);
     ok(res == ERROR_FILE_NOT_FOUND, "Expected ERROR_FILE_NOT_FOUND, got %d\n", res);
 
     RegDeleteValueA(comp, "84A88FD7F6998CE40A22FB59F6B9C2BB");
-    RegDeleteKeyA(comp, "");
+    delete_key(comp, "", access);
     RegCloseKey(comp);
 
     sprintf(keypath, keyfmt, "S-1-5-18", "241C3DA58FECD0945B9687D408766058");
-
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, keypath, &comp);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, keypath, 0, access, &comp);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
     size = MAX_PATH;
@@ -5594,11 +5632,11 @@ static void test_publish_processcomponents(void)
     ok(!lstrcmpA(val, "01\\msitest\\augustus"),
        "Expected \"01\\msitest\\augustus\", got \"%s\"\n", val);
 
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, compkey, &hkey);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, compkey, 0, access, &hkey);
     ok(res == ERROR_FILE_NOT_FOUND, "Expected ERROR_FILE_NOT_FOUND, got %d\n", res);
 
     RegDeleteValueA(comp, "84A88FD7F6998CE40A22FB59F6B9C2BB");
-    RegDeleteKeyA(comp, "");
+    delete_key(comp, "", access);
     RegCloseKey(comp);
 
 error:
@@ -5615,8 +5653,9 @@ static void test_publish(void)
     HKEY uninstall, prodkey;
     INSTALLSTATE state;
     CHAR prodcode[] = "{7DF88A48-996F-4EC8-A022-BF956F9B2CBB}";
-    char date[MAX_PATH];
-    char temp[MAX_PATH];
+    char date[MAX_PATH], temp[MAX_PATH];
+    REGSAM access = KEY_ALL_ACCESS;
+    BOOL wow64;
 
     static const CHAR subkey[] = "Software\\Microsoft\\Windows\\CurrentVersion\\Uninstall";
 
@@ -5629,7 +5668,10 @@ static void test_publish(void)
     get_date_str(date);
     GetTempPath(MAX_PATH, temp);
 
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, subkey, &uninstall);
+    if (pIsWow64Process && pIsWow64Process(GetCurrentProcess(), &wow64) && wow64)
+        access |= KEY_WOW64_64KEY;
+
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, subkey, 0, access, &uninstall);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
     CreateDirectoryA("msitest", NULL);
@@ -5653,7 +5695,7 @@ static void test_publish(void)
     ok(r == ERROR_UNKNOWN_PRODUCT, "Expected ERROR_UNKNOWN_PRODUCT, got %d\n", r);
     ok(state == INSTALLSTATE_UNKNOWN, "Expected INSTALLSTATE_UNKNOWN, got %d\n", state);
 
-    res = RegOpenKeyA(uninstall, prodcode, &prodkey);
+    res = RegOpenKeyExA(uninstall, prodcode, 0, access, &prodkey);
     ok(res == ERROR_FILE_NOT_FOUND, "Expected ERROR_FILE_NOT_FOUND, got %d\n", res);
 
     /* nothing published */
@@ -5681,7 +5723,7 @@ static void test_publish(void)
     ok(r == ERROR_UNKNOWN_PRODUCT, "Expected ERROR_UNKNOWN_PRODUCT, got %d\n", r);
     ok(state == INSTALLSTATE_UNKNOWN, "Expected INSTALLSTATE_UNKNOWN, got %d\n", state);
 
-    res = RegOpenKeyA(uninstall, prodcode, &prodkey);
+    res = RegOpenKeyExA(uninstall, prodcode, 0, access, &prodkey);
     ok(res == ERROR_FILE_NOT_FOUND, "Expected ERROR_FILE_NOT_FOUND, got %d\n", res);
 
     /* PublishProduct and RegisterProduct */
@@ -5704,7 +5746,7 @@ static void test_publish(void)
     ok(r == ERROR_UNKNOWN_COMPONENT, "Expected ERROR_UNKNOWN_COMPONENT, got %d\n", r);
     ok(state == INSTALLSTATE_UNKNOWN, "Expected INSTALLSTATE_UNKNOWN, got %d\n", state);
 
-    res = RegOpenKeyA(uninstall, prodcode, &prodkey);
+    res = RegOpenKeyExA(uninstall, prodcode, 0, access, &prodkey);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
     CHECK_REG_STR(prodkey, "DisplayName", "MSITEST");
@@ -5755,7 +5797,7 @@ static void test_publish(void)
     ok(r == ERROR_UNKNOWN_PRODUCT, "Expected ERROR_UNKNOWN_PRODUCT, got %d\n", r);
     ok(state == INSTALLSTATE_UNKNOWN, "Expected INSTALLSTATE_UNKNOWN, got %d\n", state);
 
-    res = RegOpenKeyA(uninstall, prodcode, &prodkey);
+    res = RegOpenKeyExA(uninstall, prodcode, 0, access, &prodkey);
     ok(res == ERROR_FILE_NOT_FOUND, "Expected ERROR_FILE_NOT_FOUND, got %d\n", res);
 
     /* complete install */
@@ -5778,7 +5820,7 @@ static void test_publish(void)
     ok(r == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", r);
     ok(state == INSTALLSTATE_LOCAL, "Expected INSTALLSTATE_LOCAL, got %d\n", state);
 
-    res = RegOpenKeyA(uninstall, prodcode, &prodkey);
+    res = RegOpenKeyExA(uninstall, prodcode, 0, access, &prodkey);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
     CHECK_REG_STR(prodkey, "DisplayName", "MSITEST");
@@ -5830,7 +5872,7 @@ static void test_publish(void)
     ok(r == ERROR_UNKNOWN_PRODUCT, "Expected ERROR_UNKNOWN_PRODUCT, got %d\n", r);
     ok(state == INSTALLSTATE_UNKNOWN, "Expected INSTALLSTATE_UNKNOWN, got %d\n", state);
 
-    res = RegOpenKeyA(uninstall, prodcode, &prodkey);
+    res = RegOpenKeyExA(uninstall, prodcode, 0, access, &prodkey);
     ok(res == ERROR_FILE_NOT_FOUND, "Expected ERROR_FILE_NOT_FOUND, got %d\n", res);
 
     /* complete install */
@@ -5853,7 +5895,7 @@ static void test_publish(void)
     ok(r == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", r);
     ok(state == INSTALLSTATE_LOCAL, "Expected INSTALLSTATE_LOCAL, got %d\n", state);
 
-    res = RegOpenKeyA(uninstall, prodcode, &prodkey);
+    res = RegOpenKeyExA(uninstall, prodcode, 0, access, &prodkey);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
     CHECK_REG_STR(prodkey, "DisplayName", "MSITEST");
@@ -5905,7 +5947,7 @@ static void test_publish(void)
     ok(r == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", r);
     ok(state == INSTALLSTATE_LOCAL, "Expected INSTALLSTATE_LOCAL, got %d\n", state);
 
-    res = RegOpenKeyA(uninstall, prodcode, &prodkey);
+    res = RegOpenKeyExA(uninstall, prodcode, 0, access, &prodkey);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
     CHECK_REG_STR(prodkey, "DisplayName", "MSITEST");
@@ -5957,7 +5999,7 @@ static void test_publish(void)
     ok(r == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", r);
     ok(state == INSTALLSTATE_LOCAL, "Expected INSTALLSTATE_LOCAL, got %d\n", state);
 
-    res = RegOpenKeyA(uninstall, prodcode, &prodkey);
+    res = RegOpenKeyExA(uninstall, prodcode, 0, access, &prodkey);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
     CHECK_REG_STR(prodkey, "DisplayName", "MSITEST");
@@ -6009,7 +6051,7 @@ static void test_publish(void)
     ok(r == ERROR_UNKNOWN_PRODUCT, "Expected ERROR_UNKNOWN_PRODUCT, got %d\n", r);
     ok(state == INSTALLSTATE_UNKNOWN, "Expected INSTALLSTATE_UNKNOWN, got %d\n", state);
 
-    res = RegOpenKeyA(uninstall, prodcode, &prodkey);
+    res = RegOpenKeyExA(uninstall, prodcode, 0, access, &prodkey);
     ok(res == ERROR_FILE_NOT_FOUND, "Expected ERROR_FILE_NOT_FOUND, got %d\n", res);
 
     /* complete install */
@@ -6032,7 +6074,7 @@ static void test_publish(void)
     ok(r == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", r);
     ok(state == INSTALLSTATE_LOCAL, "Expected INSTALLSTATE_LOCAL, got %d\n", state);
 
-    res = RegOpenKeyA(uninstall, prodcode, &prodkey);
+    res = RegOpenKeyExA(uninstall, prodcode, 0, access, &prodkey);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
     CHECK_REG_STR(prodkey, "DisplayName", "MSITEST");
@@ -6084,7 +6126,7 @@ static void test_publish(void)
     ok(r == ERROR_UNKNOWN_PRODUCT, "Expected ERROR_UNKNOWN_PRODUCT, got %d\n", r);
     ok(state == INSTALLSTATE_UNKNOWN, "Expected INSTALLSTATE_UNKNOWN, got %d\n", state);
 
-    res = RegOpenKeyA(uninstall, prodcode, &prodkey);
+    res = RegOpenKeyExA(uninstall, prodcode, 0, access, &prodkey);
     ok(res == ERROR_FILE_NOT_FOUND, "Expected ERROR_FILE_NOT_FOUND, got %d\n", res);
 
     /* make sure 'Program Files\msitest' is removed */
@@ -7070,12 +7112,17 @@ static void test_writeregistryvalues(void)
     HKEY hkey;
     DWORD type, size;
     CHAR path[MAX_PATH];
+    REGSAM access = KEY_ALL_ACCESS;
+    BOOL wow64;
 
     CreateDirectoryA("msitest", NULL);
     create_file("msitest\\augustus", 500);
 
     create_database(msifile, wrv_tables, sizeof(wrv_tables) / sizeof(msi_table));
 
+    if (pIsWow64Process && pIsWow64Process(GetCurrentProcess(), &wow64) && wow64)
+        access |= KEY_WOW64_64KEY;
+
     MsiSetInternalUI(INSTALLUILEVEL_NONE, NULL);
 
     r = MsiInstallProductA(msifile, NULL);
@@ -7088,7 +7135,7 @@ static void test_writeregistryvalues(void)
     ok(delete_pf("msitest\\augustus", TRUE), "File installed\n");
     ok(delete_pf("msitest", FALSE), "File installed\n");
 
-    res = RegOpenKey(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest", &hkey);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest", 0, access, &hkey);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
     size = MAX_PATH;
@@ -7100,8 +7147,8 @@ static void test_writeregistryvalues(void)
     ok(size == 15, "Expected 15, got %d\n", size);
     ok(type == REG_MULTI_SZ, "Expected REG_MULTI_SZ, got %d\n", type);
 
-    RegDeleteKeyA(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest");
-    RegDeleteKeyA(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine");
+    delete_key(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine\\msitest", access);
+    delete_key(HKEY_LOCAL_MACHINE, "SOFTWARE\\Wine", access);
 
 error:
     DeleteFile(msifile);
@@ -7663,8 +7710,9 @@ static void test_MsiConfigureProductEx(void)
     LONG res;
     DWORD type, size;
     HKEY props, source;
-    CHAR keypath[MAX_PATH * 2];
-    CHAR localpack[MAX_PATH];
+    CHAR keypath[MAX_PATH * 2], localpack[MAX_PATH];
+    REGSAM access = KEY_ALL_ACCESS;
+    BOOL wow64;
 
     if (on_win9x)
     {
@@ -7679,6 +7727,9 @@ static void test_MsiConfigureProductEx(void)
 
     create_database(msifile, mcp_tables, sizeof(mcp_tables) / sizeof(msi_table));
 
+    if (pIsWow64Process && pIsWow64Process(GetCurrentProcess(), &wow64) && wow64)
+        access |= KEY_WOW64_64KEY;
+
     MsiSetInternalUI(INSTALLUILEVEL_NONE, NULL);
 
     /* NULL szProduct */
@@ -7818,7 +7869,7 @@ static void test_MsiConfigureProductEx(void)
     lstrcatA(keypath, "Installer\\UserData\\S-1-5-18\\Products\\");
     lstrcatA(keypath, "84A88FD7F6998CE40A22FB59F6B9C2BB\\InstallProperties");
 
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, keypath, &props);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, keypath, 0, access, &props);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
     res = RegSetValueExA(props, "LocalPackage", 0, REG_SZ,
@@ -7861,7 +7912,7 @@ static void test_MsiConfigureProductEx(void)
     lstrcatA(keypath, "Installer\\UserData\\S-1-5-18\\Products\\");
     lstrcatA(keypath, "84A88FD7F6998CE40A22FB59F6B9C2BB\\InstallProperties");
 
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, keypath, &props);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, keypath, 0, access, &props);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
     res = RegSetValueExA(props, "LocalPackage", 0, REG_SZ,
@@ -7871,7 +7922,7 @@ static void test_MsiConfigureProductEx(void)
     lstrcpyA(keypath, "SOFTWARE\\Classes\\Installer\\Products\\");
     lstrcatA(keypath, "84A88FD7F6998CE40A22FB59F6B9C2BB\\SourceList");
 
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, keypath, &source);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, keypath, 0, access, &source);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
     type = REG_SZ;
@@ -8843,6 +8894,8 @@ static void test_MsiSetExternalUI(void)
 static void test_feature_override(void)
 {
     UINT r;
+    REGSAM access = KEY_ALL_ACCESS;
+    BOOL wow64;
 
     create_test_files();
     create_file("msitest\\override.txt", 1000);
@@ -8850,6 +8903,9 @@ static void test_feature_override(void)
     create_file("msitest\\notpreselected.txt", 1000);
     create_database(msifile, fo_tables, sizeof(fo_tables) / sizeof(msi_table));
 
+    if (pIsWow64Process && pIsWow64Process(GetCurrentProcess(), &wow64) && wow64)
+        access |= KEY_WOW64_64KEY;
+
     r = MsiInstallProductA(msifile, "ADDLOCAL=override");
     if (r == ERROR_INSTALL_PACKAGE_REJECTED)
     {
@@ -8899,7 +8955,7 @@ static void test_feature_override(void)
     ok(delete_pf("msitest", FALSE), "directory removed\n");
     }
 
-    RegDeleteKeyA(HKEY_LOCAL_MACHINE, "Software\\Wine\\msitest");
+    delete_key(HKEY_LOCAL_MACHINE, "Software\\Wine\\msitest", access);
 
 error:
     DeleteFileA("msitest\\override.txt");
@@ -9182,11 +9238,16 @@ static void test_register_font(void)
     LONG ret;
     HKEY key;
     UINT r;
+    REGSAM access = KEY_ALL_ACCESS;
+    BOOL wow64;
 
     create_test_files();
     create_file("msitest\\font.ttf", 1000);
     create_database(msifile, font_tables, sizeof(font_tables) / sizeof(msi_table));
 
+    if (pIsWow64Process && pIsWow64Process(GetCurrentProcess(), &wow64) && wow64)
+        access |= KEY_WOW64_64KEY;
+
     MsiSetInternalUI(INSTALLUILEVEL_NONE, NULL);
 
     r = MsiInstallProductA(msifile, NULL);
@@ -9197,9 +9258,9 @@ static void test_register_font(void)
     }
     ok(r == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %u\n", r);
 
-    ret = RegOpenKeyA(HKEY_LOCAL_MACHINE, regfont1, &key);
+    ret = RegOpenKeyExA(HKEY_LOCAL_MACHINE, regfont1, 0, access, &key);
     if (ret)
-        RegOpenKeyA(HKEY_LOCAL_MACHINE, regfont2, &key);
+        RegOpenKeyExA(HKEY_LOCAL_MACHINE, regfont2, 0, access, &key);
 
     ret = RegQueryValueExA(key, "msi test font", NULL, NULL, NULL, NULL);
     ok(ret != ERROR_FILE_NOT_FOUND, "unexpected result %d\n", ret);
@@ -9474,28 +9535,33 @@ static void test_remove_registry_values(void)
     UINT r;
     LONG res;
     HKEY key;
+    REGSAM access = KEY_ALL_ACCESS;
+    BOOL wow64;
 
     create_test_files();
     create_file("msitest\\registry.txt", 1000);
     create_database(msifile, rrv_tables, sizeof(rrv_tables) / sizeof(msi_table));
 
+    if (pIsWow64Process && pIsWow64Process(GetCurrentProcess(), &wow64) && wow64)
+        access |= KEY_WOW64_64KEY;
+
     MsiSetInternalUI(INSTALLUILEVEL_NONE, NULL);
 
-    RegCreateKeyA(HKEY_LOCAL_MACHINE, "Software\\Wine\\key1", &key);
+    RegCreateKeyExA(HKEY_LOCAL_MACHINE, "Software\\Wine\\key1", 0, NULL, 0, access, NULL, &key, NULL);
     RegSetValueExA(key, "value1", 0, REG_SZ, (const BYTE *)"1", 2);
     RegCloseKey(key);
 
-    RegCreateKeyA(HKEY_LOCAL_MACHINE, "Software\\Wine\\key2", &key);
+    RegCreateKeyExA(HKEY_LOCAL_MACHINE, "Software\\Wine\\key2", 0, NULL, 0, access, NULL, &key, NULL);
     RegSetValueExA(key, "value2", 0, REG_SZ, (const BYTE *)"2", 2);
     RegCloseKey(key);
 
-    RegCreateKeyA(HKEY_LOCAL_MACHINE, "Software\\Wine\\keyA", &key);
+    RegCreateKeyExA(HKEY_LOCAL_MACHINE, "Software\\Wine\\keyA", 0, NULL, 0, access, NULL, &key, NULL);
     RegSetValueExA(key, "", 0, REG_SZ, (const BYTE *)"default", 8);
     RegSetValueExA(key, "valueA", 0, REG_SZ, (const BYTE *)"A", 2);
     RegSetValueExA(key, "valueB", 0, REG_SZ, (const BYTE *)"B", 2);
     RegCloseKey(key);
 
-    RegCreateKeyA(HKEY_LOCAL_MACHINE, "Software\\Wine\\keyB", &key);
+    RegCreateKeyExA(HKEY_LOCAL_MACHINE, "Software\\Wine\\keyB", 0, NULL, 0, access, NULL, &key, NULL);
     RegSetValueExA(key, "", 0, REG_SZ, (const BYTE *)"default", 8);
     RegSetValueExA(key, "valueB", 0, REG_SZ, (const BYTE *)"B", 2);
     RegCloseKey(key);
@@ -9508,46 +9574,46 @@ static void test_remove_registry_values(void)
     }
     ok(r == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %u\n", r);
 
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, "Software\\Wine\\key1", &key);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, "Software\\Wine\\key1", 0, access, &key);
     ok(res == ERROR_SUCCESS, "key removed\n");
     RegCloseKey(key);
 
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, "Software\\Wine\\key2", &key);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, "Software\\Wine\\key2", 0, access, &key);
     ok(res == ERROR_FILE_NOT_FOUND, "key not removed\n");
 
-    res = RegCreateKeyA(HKEY_LOCAL_MACHINE, "Software\\Wine\\key2", &key);
+    res = RegCreateKeyExA(HKEY_LOCAL_MACHINE, "Software\\Wine\\key2", 0, NULL, 0, access, NULL, &key, NULL);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
     RegCloseKey(key);
 
     r = MsiInstallProductA(msifile, "REMOVE=ALL");
     ok(r == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %u\n", r);
 
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, "Software\\Wine\\key1", &key);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, "Software\\Wine\\key1", 0, access, &key);
     ok(res == ERROR_FILE_NOT_FOUND, "key not removed\n");
 
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, "Software\\Wine\\key2", &key);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, "Software\\Wine\\key2", 0, access, &key);
     ok(res == ERROR_SUCCESS, "key removed\n");
     RegCloseKey(key);
 
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, "Software\\Wine\\keyA", &key);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, "Software\\Wine\\keyA", 0, access, &key);
     ok(res == ERROR_SUCCESS, "key removed\n");
     RegCloseKey(key);
 
-    res = RegOpenKeyA(HKEY_LOCAL_MACHINE, "Software\\Wine\\keyB", &key);
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, "Software\\Wine\\keyB", 0, access, &key);
     ok(res == ERROR_FILE_NOT_FOUND, "key not removed\n");
 
-    RegDeleteKeyA(HKEY_LOCAL_MACHINE, "Software\\Wine\\keyA");
-    RegDeleteKeyA(HKEY_LOCAL_MACHINE, "Software\\Wine\\key2");
-    RegDeleteKeyA(HKEY_LOCAL_MACHINE, "Software\\Wine");
+    delete_key(HKEY_LOCAL_MACHINE, "Software\\Wine\\keyA", access);
+    delete_key(HKEY_LOCAL_MACHINE, "Software\\Wine\\key2", access);
+    delete_key(HKEY_LOCAL_MACHINE, "Software\\Wine", access);
 
     ok(!delete_pf("msitest\\registry.txt", TRUE), "file not removed\n");
     ok(!delete_pf("msitest", FALSE), "directory not removed\n");
 
 error:
-    RegDeleteKeyA(HKEY_LOCAL_MACHINE, "Software\\Wine\\key1");
-    RegDeleteKeyA(HKEY_LOCAL_MACHINE, "Software\\Wine\\key2");
-    RegDeleteKeyA(HKEY_LOCAL_MACHINE, "Software\\Wine\\keyA");
-    RegDeleteKeyA(HKEY_LOCAL_MACHINE, "Software\\Wine\\keyB");
+    delete_key(HKEY_LOCAL_MACHINE, "Software\\Wine\\key1", access);
+    delete_key(HKEY_LOCAL_MACHINE, "Software\\Wine\\key2", access);
+    delete_key(HKEY_LOCAL_MACHINE, "Software\\Wine\\keyA", access);
+    delete_key(HKEY_LOCAL_MACHINE, "Software\\Wine\\keyB", access);
 
     DeleteFileA("msitest\\registry.txt");
     delete_test_files();
diff --git a/dlls/msi/tests/package.c b/dlls/msi/tests/package.c
index 89be16eeee..e4f71368a3 100644
--- a/dlls/msi/tests/package.c
+++ b/dlls/msi/tests/package.c
@@ -37,6 +37,7 @@ static UINT (WINAPI *pMsiApplyMultiplePatchesA)(LPCSTR, LPCSTR, LPCSTR);
 
 static BOOL (WINAPI *pConvertSidToStringSidA)(PSID, LPSTR*);
 static LONG (WINAPI *pRegDeleteKeyExA)(HKEY, LPCSTR, REGSAM, DWORD);
+static LONG (WINAPI *pRegDeleteKeyExW)(HKEY, LPCWSTR, REGSAM, DWORD);
 static BOOL (WINAPI *pIsWow64Process)(HANDLE, PBOOL);
 
 static BOOL (WINAPI *pSRRemoveRestorePoint)(DWORD);
@@ -56,6 +57,7 @@ static void init_functionpointers(void)
 
     GET_PROC(hadvapi32, ConvertSidToStringSidA);
     GET_PROC(hadvapi32, RegDeleteKeyExA)
+    GET_PROC(hadvapi32, RegDeleteKeyExW)
     GET_PROC(hkernel32, IsWow64Process)
 
     hsrclient = LoadLibraryA("srclient.dll");
@@ -96,7 +98,7 @@ static LPSTR get_user_sid(LPSTR *usersid)
 }
 
 /* RegDeleteTreeW from dlls/advapi32/registry.c */
-static LSTATUS package_RegDeleteTreeW(HKEY hKey, LPCWSTR lpszSubKey)
+static LSTATUS package_RegDeleteTreeW(HKEY hKey, LPCWSTR lpszSubKey, REGSAM access)
 {
     LONG ret;
     DWORD dwMaxSubkeyLen, dwMaxValueLen;
@@ -106,7 +108,7 @@ static LSTATUS package_RegDeleteTreeW(HKEY hKey, LPCWSTR lpszSubKey)
 
     if(lpszSubKey)
     {
-        ret = RegOpenKeyExW(hKey, lpszSubKey, 0, KEY_READ, &hSubKey);
+        ret = RegOpenKeyExW(hKey, lpszSubKey, 0, access, &hSubKey);
         if (ret) return ret;
     }
 
@@ -134,12 +136,17 @@ static LSTATUS package_RegDeleteTreeW(HKEY hKey, LPCWSTR lpszSubKey)
         if (RegEnumKeyExW(hSubKey, 0, lpszName, &dwSize, NULL,
                           NULL, NULL, NULL)) break;
 
-        ret = package_RegDeleteTreeW(hSubKey, lpszName);
+        ret = package_RegDeleteTreeW(hSubKey, lpszName, access);
         if (ret) goto cleanup;
     }
 
     if (lpszSubKey)
-        ret = RegDeleteKeyW(hKey, lpszSubKey);
+    {
+        if (pRegDeleteKeyExW)
+            ret = pRegDeleteKeyExW(hKey, lpszSubKey, access, 0);
+        else
+            ret = RegDeleteKeyW(hKey, lpszSubKey);
+    }
     else
         while (TRUE)
         {
@@ -221,6 +228,11 @@ static void set_component_path(LPCSTR filename, MSIINSTALLCONTEXT context,
     CHAR path[MAX_PATH];
     LPCSTR prod = NULL;
     HKEY hkey;
+    REGSAM access = KEY_ALL_ACCESS;
+    BOOL wow64;
+
+    if (pIsWow64Process && pIsWow64Process(GetCurrentProcess(), &wow64) && wow64)
+        access |= KEY_WOW64_64KEY;
 
     MultiByteToWideChar(CP_ACP, 0, guid, -1, guidW, MAX_PATH);
     squash_guid(guidW, squashedW);
@@ -259,7 +271,7 @@ static void set_component_path(LPCSTR filename, MSIINSTALLCONTEXT context,
                 "7D2F387510109040002000060BECB6AB", usersid);
     }
 
-    RegCreateKeyA(HKEY_LOCAL_MACHINE, comppath, &hkey);
+    RegCreateKeyExA(HKEY_LOCAL_MACHINE, comppath, 0, NULL, 0, access, NULL, &hkey, NULL);
 
     lstrcpyA(path, CURR_DIR);
     lstrcatA(path, "\\");
@@ -268,7 +280,7 @@ static void set_component_path(LPCSTR filename, MSIINSTALLCONTEXT context,
     RegSetValueExA(hkey, prod, 0, REG_SZ, (LPBYTE)path, lstrlenA(path));
     RegCloseKey(hkey);
 
-    RegCreateKeyA(HKEY_LOCAL_MACHINE, prodpath, &hkey);
+    RegCreateKeyExA(HKEY_LOCAL_MACHINE, prodpath, 0, NULL, 0, access, NULL, &hkey, NULL);
     RegCloseKey(hkey);
 }
 
@@ -280,6 +292,11 @@ static void delete_component_path(LPCSTR guid, MSIINSTALLCONTEXT context, LPSTR
     CHAR squashed[MAX_PATH];
     CHAR comppath[MAX_PATH];
     CHAR prodpath[MAX_PATH];
+    REGSAM access = KEY_ALL_ACCESS;
+    BOOL wow64;
+
+    if (pIsWow64Process && pIsWow64Process(GetCurrentProcess(), &wow64) && wow64)
+        access |= KEY_WOW64_64KEY;
 
     MultiByteToWideChar(CP_ACP, 0, guid, -1, guidW, MAX_PATH);
     squash_guid(guidW, squashedW);
@@ -316,10 +333,10 @@ static void delete_component_path(LPCSTR guid, MSIINSTALLCONTEXT context, LPSTR
     }
 
     MultiByteToWideChar(CP_ACP, 0, comppath, -1, substrW, MAX_PATH);
-    package_RegDeleteTreeW(HKEY_LOCAL_MACHINE, substrW);
+    package_RegDeleteTreeW(HKEY_LOCAL_MACHINE, substrW, access);
 
     MultiByteToWideChar(CP_ACP, 0, prodpath, -1, substrW, MAX_PATH);
-    package_RegDeleteTreeW(HKEY_LOCAL_MACHINE, substrW);
+    package_RegDeleteTreeW(HKEY_LOCAL_MACHINE, substrW, access);
 }
 
 static UINT do_query(MSIHANDLE hdb, const char *query, MSIHANDLE *phrec)
@@ -7806,19 +7823,19 @@ error:
 static void test_appsearch_reglocator(void)
 {
     MSIHANDLE hpkg, hdb;
-    CHAR path[MAX_PATH];
-    CHAR prop[MAX_PATH];
-    DWORD binary[2];
-    DWORD size, val;
+    CHAR path[MAX_PATH], prop[MAX_PATH];
+    DWORD binary[2], size, val;
     BOOL space, version;
-    HKEY hklm, classes;
-    HKEY hkcu, users;
-    LPSTR pathdata;
-    LPSTR pathvar;
+    HKEY hklm, classes, hkcu, users;
+    LPSTR pathdata, pathvar, ptr;
     LPCSTR str;
-    LPSTR ptr;
     LONG res;
     UINT r;
+    REGSAM access = KEY_ALL_ACCESS;
+    BOOL wow64;
+
+    if (pIsWow64Process && pIsWow64Process(GetCurrentProcess(), &wow64) && wow64)
+        access |= KEY_WOW64_64KEY;
 
     version = TRUE;
     if (!create_file_with_version("test.dll", MAKELONG(2, 1), MAKELONG(4, 3)))
@@ -7858,7 +7875,7 @@ static void test_appsearch_reglocator(void)
         ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
     }
 
-    res = RegCreateKeyA(HKEY_LOCAL_MACHINE, "Software\\Wine", &hklm);
+    res = RegCreateKeyExA(HKEY_LOCAL_MACHINE, "Software\\Wine", 0, NULL, 0, access, NULL, &hklm, NULL);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);
 
     res = RegSetValueA(hklm, NULL, REG_SZ, "defvalue", 8);
@@ -8464,7 +8481,7 @@ static void test_appsearch_reglocator(void)
     RegDeleteValueA(hklm, "Value15");
     RegDeleteValueA(hklm, "Value16");
     RegDeleteValueA(hklm, "Value17");
-    RegDeleteKeyA(hklm, "");
+    delete_key(hklm, "", access);
     RegCloseKey(hklm);
 
     RegDeleteValueA(classes, "Value1");
@@ -9476,13 +9493,17 @@ static void test_featureparents(void)
 static void test_installprops(void)
 {
     MSIHANDLE hpkg, hdb;
-    CHAR path[MAX_PATH];
-    CHAR buf[MAX_PATH];
+    CHAR path[MAX_PATH], buf[MAX_PATH];
     DWORD size, type;
     LANGID langid;
     HKEY hkey1, hkey2;
     int res;
     UINT r;
+    REGSAM access = KEY_ALL_ACCESS;
+    BOOL wow64;
+
+    if (pIsWow64Process && pIsWow64Process(GetCurrentProcess(), &wow64) && wow64)
+        access |= KEY_WOW64_64KEY;
 
     GetCurrentDirectory(MAX_PATH, path);
     lstrcat(path, "\\");
@@ -9508,8 +9529,7 @@ static void test_installprops(void)
     ok( !lstrcmp(buf, path), "Expected %s, got %s\n", path, buf);
 
     RegOpenKey(HKEY_CURRENT_USER, "SOFTWARE\\Microsoft\\MS Setup (ACME)\\User Info", &hkey1);
-
-    RegOpenKey(HKEY_LOCAL_MACHINE, "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion", &hkey2);
+    RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion", 0, access, &hkey2);
 
     size = MAX_PATH;
     type = REG_SZ;