diff --git a/Source/Core/DiscIO/Src/Blob.cpp b/Source/Core/DiscIO/Src/Blob.cpp
index ef198f43d6..35b53e54fd 100644
--- a/Source/Core/DiscIO/Src/Blob.cpp
+++ b/Source/Core/DiscIO/Src/Blob.cpp
@@ -278,7 +278,7 @@ class CompressedBlobReader
 					offset &= ~(1ULL << 63);
 				}
 
-				u8* source = mapped_file->Lock(offset, comp_block_size);
+				u8* source = mapped_file->Lock(offset, comp_block_size + 64*1024);
 				u8* dest = cache[0];
 
 				if (uncompressed)
@@ -421,10 +421,14 @@ bool CompressFileToBlob(const char* infile, const char* outfile, u32 sub_type, i
 
 	for (u32 i = 0; i < header.num_blocks; i++)
 	{
-		if (i % (header.num_blocks / 100) == 0)
+		if (i % (header.num_blocks / 1000) == 0)
 		{
 			u64 inpos = ftell(inf);
-			int ratio = (int)(100 * position / inpos);
+			int ratio = 0;
+			if (inpos != 0)
+			{
+				ratio = (int)(100 * position / inpos);
+			}
 			char temp[512];
 			sprintf(temp, "%i of %i blocks. compression ratio %i%%", i, header.num_blocks, ratio);
 			callback(temp, (float)i / (float)header.num_blocks, arg);
diff --git a/Source/Core/DiscIO/Src/Blob.h b/Source/Core/DiscIO/Src/Blob.h
index 5c2ae04259..d8de08d30a 100644
--- a/Source/Core/DiscIO/Src/Blob.h
+++ b/Source/Core/DiscIO/Src/Blob.h
@@ -42,7 +42,7 @@ class IBlobReader
 
 	private:
 
-		IBlobReader(const IBlobReader& other) {}
+		IBlobReader(const IBlobReader& /*other*/) {}
 };
 
 
diff --git a/Source/Core/DolphinWX/Src/GameListCtrl.cpp b/Source/Core/DolphinWX/Src/GameListCtrl.cpp
index 7bee16cf40..8b5d4959e4 100644
--- a/Source/Core/DolphinWX/Src/GameListCtrl.cpp
+++ b/Source/Core/DolphinWX/Src/GameListCtrl.cpp
@@ -26,6 +26,7 @@
 #include "BootManager.h"
 #include "Config.h"
 #include "GameListCtrl.h"
+#include "Blob.h"
 
 #if USE_XPM_BITMAPS
     #include "../resources/Flag_Europe.xpm"
@@ -45,6 +46,7 @@ EVT_LIST_COL_END_DRAG(LIST_CTRL, CGameListCtrl::OnColEndDrag)
 EVT_MENU(IDM_EDITPATCHFILE, CGameListCtrl::OnEditPatchFile)
 EVT_MENU(IDM_OPENCONTAININGFOLDER, CGameListCtrl::OnOpenContainingFolder)
 EVT_MENU(IDM_SETDEFAULTGCM, CGameListCtrl::OnSetDefaultGCM)
+EVT_MENU(IDM_COMPRESSGCM, CGameListCtrl::OnCompressGCM)
 END_EVENT_TABLE()
 
 CGameListCtrl::CGameListCtrl(wxWindow* parent, const wxWindowID id, const wxPoint& pos, const wxSize& size, long style)
@@ -344,6 +346,14 @@ void CGameListCtrl::OnRightClick(wxMouseEvent& event)
 		popupMenu.Append(IDM_EDITPATCHFILE, wxString::FromAscii(menu_text.c_str())); //Pretty much everything in wxwidgets is a wxString, try to convert to those first!
 		popupMenu.Append(IDM_OPENCONTAININGFOLDER, wxString::FromAscii("Open &containing folder"));
 		popupMenu.Append(IDM_SETDEFAULTGCM, wxString::FromAscii("Set as &default ISO"));
+
+		/* F|RES: compression doesn't work and will be rewritten ... if it is done reactivated this code the gui is ready :D
+		if (selected_iso->IsCompressed())
+			popupMenu.Append(IDM_COMPRESSGCM, wxString::FromAscii("Decompress ISO... (UNTESTED)"));
+		else
+			popupMenu.Append(IDM_COMPRESSGCM, wxString::FromAscii("Compress ISO... (UNTESTED)"));
+			*/
+
 		PopupMenu(&popupMenu);
 	}
 }
@@ -391,6 +401,79 @@ void CGameListCtrl::OnSetDefaultGCM(wxCommandEvent& WXUNUSED (event)) {
 	SConfig::GetInstance().SaveSettings();
 }
 
+void CGameListCtrl::CompressCB(const char* text, float percent, void* arg)
+{
+	wxProgressDialog* pDialog = (wxProgressDialog*)arg;
+	pDialog->Update((int)(percent*1000), wxString::FromAscii(text));
+}
+
+void CGameListCtrl::OnCompressGCM(wxCommandEvent& WXUNUSED (event)) {
+	const CISOFile *iso = GetSelectedISO();
+	if (!iso)
+		return;
+
+	wxString path;
+
+	if (iso->IsCompressed())
+	{
+		 path = wxFileSelector(
+			_T("Select the file to save"),
+			wxEmptyString, wxEmptyString, wxEmptyString,
+			wxString::Format
+			(
+			_T("All GC/Wii ISO files (gcz)|*.gcz|All files (%s)|%s"),
+			wxFileSelectorDefaultWildcardStr,
+			wxFileSelectorDefaultWildcardStr
+			),
+			wxFD_SAVE,
+			this);
+
+		if (!path)
+		{
+			return;
+		}
+	}
+	else
+	{
+		path = wxFileSelector(
+			_T("Select the file to save"),
+			wxEmptyString, wxEmptyString, wxEmptyString,
+			wxString::Format
+			(
+			_T("All compressed GC/Wii ISO files (gcz)|*.gcz|All files (%s)|%s"),
+			wxFileSelectorDefaultWildcardStr,
+			wxFileSelectorDefaultWildcardStr
+			),
+			wxFD_SAVE,
+			this);
+
+		if (!path)
+		{
+			return;
+		}
+	}
+
+	wxProgressDialog dialog(_T("Scanning for ISOs"),
+		_T("Scanning..."),
+		1000, // range
+		this, // parent
+		wxPD_APP_MODAL |
+		// wxPD_AUTO_HIDE | -- try this as well
+		wxPD_ELAPSED_TIME |
+		wxPD_ESTIMATED_TIME |
+		wxPD_REMAINING_TIME |
+		wxPD_SMOOTH // - makes indeterminate mode bar on WinXP very small
+		);
+
+	dialog.CenterOnParent();
+	dialog.SetSize(wxSize(280, 180));
+
+	if (iso->IsCompressed())
+		DiscIO::DecompressBlobToFile(iso->GetFileName().c_str(), path.c_str(), &CompressCB, &dialog);	
+	else
+		DiscIO::CompressFileToBlob(iso->GetFileName().c_str(), path.c_str(), 0, 16384, &CompressCB, &dialog);
+}
+
 void CGameListCtrl::OnEditPatchFile(wxCommandEvent& WXUNUSED (event))
 {
 	const CISOFile *iso = GetSelectedISO();
diff --git a/Source/Core/DolphinWX/Src/GameListCtrl.h b/Source/Core/DolphinWX/Src/GameListCtrl.h
index c6ab5853d7..6c6ae894e0 100644
--- a/Source/Core/DolphinWX/Src/GameListCtrl.h
+++ b/Source/Core/DolphinWX/Src/GameListCtrl.h
@@ -69,10 +69,13 @@ class CGameListCtrl : public wxListCtrl
 		void OnEditPatchFile(wxCommandEvent& event);
 		void OnOpenContainingFolder(wxCommandEvent& event);
 		void OnSetDefaultGCM(wxCommandEvent& event);
+		void OnCompressGCM(wxCommandEvent& event);
 
 		virtual bool MSWDrawSubItem(wxPaintDC& rPaintDC, int item, int subitem);
 
 		void AutomaticColumnWidth();
+
+		static void CompressCB(const char* text, float percent, void* arg);
 };
 
 
diff --git a/Source/Core/DolphinWX/Src/Globals.h b/Source/Core/DolphinWX/Src/Globals.h
index fe3cf02569..3f8aff4e54 100644
--- a/Source/Core/DolphinWX/Src/Globals.h
+++ b/Source/Core/DolphinWX/Src/Globals.h
@@ -50,6 +50,7 @@ enum
 	IDM_EDITPATCHFILE,
 	IDM_OPENCONTAININGFOLDER,
 	IDM_SETDEFAULTGCM,
+	IDM_COMPRESSGCM,
 	IDM_PLUGIN_OPTIONS,
 	IDM_CONFIG_GFX_PLUGIN,
 	IDM_CONFIG_DSP_PLUGIN,
diff --git a/Source/Core/DolphinWX/Src/ISOFile.cpp b/Source/Core/DolphinWX/Src/ISOFile.cpp
index 1040067404..6d89020923 100644
--- a/Source/Core/DolphinWX/Src/ISOFile.cpp
+++ b/Source/Core/DolphinWX/Src/ISOFile.cpp
@@ -25,6 +25,7 @@
 #include "Filesystem.h"
 #include "BannerLoader.h"
 #include "FileSearch.h"
+#include "Blob.h"
 
 #define DVD_BANNER_WIDTH 96
 #define DVD_BANNER_HEIGHT 32
@@ -34,7 +35,8 @@ static u32 g_ImageTemp[DVD_BANNER_WIDTH * DVD_BANNER_HEIGHT];
 CISOFile::CISOFile(const std::string& _rFileName)
 	: m_FileName(_rFileName),
 	m_FileSize(0),
-	m_Valid(false)
+	m_Valid(false),
+	m_BlobCompressed(false)
 {
 	DiscIO::IVolume* pVolume = DiscIO::CreateVolumeFromFilename(_rFileName);
 
@@ -45,6 +47,7 @@ CISOFile::CISOFile(const std::string& _rFileName)
 		m_FileSize = pVolume->GetSize();
 		m_Name = pVolume->GetName();
 		m_UniqueID = pVolume->GetUniqueID();
+		m_BlobCompressed = DiscIO::IsCompressedBlob(_rFileName.c_str());
 
 		// check if we can get some infos from the banner file too
 		DiscIO::IFileSystem* pFileSystem = DiscIO::CreateFileSystem(*pVolume);
diff --git a/Source/Core/DolphinWX/Src/ISOFile.h b/Source/Core/DolphinWX/Src/ISOFile.h
index 44d430e2fe..66b5306c32 100644
--- a/Source/Core/DolphinWX/Src/ISOFile.h
+++ b/Source/Core/DolphinWX/Src/ISOFile.h
@@ -41,6 +41,8 @@ class CISOFile
 
 		DiscIO::IVolume::ECountry GetCountry() const {return(m_Country);}
 
+		bool IsCompressed() const {return(m_BlobCompressed); }
+
 		u64 GetFileSize() const {return(m_FileSize);}
 
 		const wxImage& GetImage() const {return(m_Image);}
@@ -65,6 +67,8 @@ class CISOFile
 		wxImage m_Image;
 
 		bool m_Valid;
+
+		bool m_BlobCompressed;
 };