Check out this little link: You receive an "interface not registered" error message when you try to build a Setup project in Visual Studio .NET
Why this is happening in the first place, I do not know, but the fix worked wonderfully. I was trying to build a Net 1.1 setup vdproj with Visual Studio 2003 and I got the error: "Could not find the file '[file that was obviously there]' 'Interface not registered' ".


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