I have written a Thumbnail Provider with C# using IExtractImage.
It works great on Windows 7 32-bit and Windows XP 32-bit.
On Windows 7 64-bit, it works well in explorer; it does not work in Open File Dialogs from my Windows Form 32-bit application or from Firefox 32-bit (File/Open File);
all I see are big white file icons; thumbnails are not generated.
The DLL is targetting any CPU, .NET Framework 4.
The Exe Windows Form is targetting x86, .NET Framework 4.
To solve the problem, I think I would need to change the Exe target to any CPU, but I can not since the Exe is also using x86 assemblies.
How to solve the problem ?
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