diff --git a/dlls/appwiz.cpl/addons.c b/dlls/appwiz.cpl/addons.c
index 8703f97d3e..1cff5c4480 100644
--- a/dlls/appwiz.cpl/addons.c
+++ b/dlls/appwiz.cpl/addons.c
@@ -84,7 +84,7 @@ static const addon_info_t addons_info[] = {
     }
 };
 
-static const addon_info_t *addon = &addons_info[0];
+static const addon_info_t *addon;
 
 static HWND install_dialog = NULL;
 static LPWSTR url = NULL;
@@ -553,18 +553,20 @@ static INT_PTR CALLBACK installer_proc(HWND hwnd, UINT msg, WPARAM wParam, LPARA
     return FALSE;
 }
 
-BOOL install_wine_gecko(void)
+BOOL install_addon(addon_t addon_type)
 {
     if(!*ARCH_STRING)
         return FALSE;
 
+    addon = addons_info+addon_type;
+
     /*
-     * Try to find Gecko .cab file in following order:
-     * - directory stored in GeckoCabDir value of HKCU/Wine/Software/MSHTML key
-     * - $datadir/gecko/
-     * - $INSTALL_DATADIR/wine/gecko/
-     * - /usr/share/wine/gecko/
-     * - download from URL stored in GeckoUrl value of HKCU/Wine/Software/MSHTML key
+     * Try to find addon .msi file in following order:
+     * - directory stored in $dir_config_key value of HKCU/Wine/Software/$config_key key
+     * - $datadir/$addon_subdir/
+     * - $INSTALL_DATADIR/wine/$addon_subdir/
+     * - /usr/share/wine/$addon_subdir/
+     * - download from URL stored in $url_config_key value of HKCU/Wine/Software/$config_key key
      */
     if(!install_from_registered_dir()
        && !install_from_default_dir()
diff --git a/dlls/appwiz.cpl/appwiz.c b/dlls/appwiz.cpl/appwiz.c
index 1d8f47c95c..14ace66818 100644
--- a/dlls/appwiz.cpl/appwiz.c
+++ b/dlls/appwiz.cpl/appwiz.c
@@ -975,7 +975,7 @@ static LONG start_params(const WCHAR *params)
         return FALSE;
 
     if(!strcmpW(params, install_geckoW)) {
-        install_wine_gecko();
+        install_addon(ADDON_GECKO);
         return TRUE;
     }
 
diff --git a/dlls/appwiz.cpl/appwiz.h b/dlls/appwiz.cpl/appwiz.h
index d4f9375866..6e189fa1dc 100644
--- a/dlls/appwiz.cpl/appwiz.h
+++ b/dlls/appwiz.cpl/appwiz.h
@@ -16,7 +16,11 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  */
 
-BOOL install_wine_gecko(void) DECLSPEC_HIDDEN;
+typedef enum {
+    ADDON_GECKO
+} addon_t;
+
+BOOL install_addon(addon_t) DECLSPEC_HIDDEN;
 
 extern HINSTANCE hInst DECLSPEC_HIDDEN;