If I develop a 64 bit webpart DLL does it work with SharePoint 2007 32 bit?
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2What makes your webpart 64 bit? – ArjanP Jan 11 '10 at 02:41
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No can do. You can't load 64-bit DLL in a 32-bit process.
Franci Penov
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1Nope, you can't force 64-bit dll in a 32-bit process. I would rather focus on ArjanP's question of why is your web-part 64-bit only? Can you install a 32-bit version of it? – Franci Penov Jan 11 '10 at 18:04
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Then you have to build two versions of your web part - one 32-bit and one 64-bit. Even if there was a magic setting that would allow 32-bit SharePoint to load 64-bit webparts, I would assume that it's under the control of the SP admin, not yours. – Franci Penov Jan 12 '10 at 06:35
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By default a .NET assembly will target "Any CPU" (see Build > Configuration manager in Visual Studio).
This means that the Intermediate Language (IL) code produced will be Just In Time (JIT) compiled into 32bit code when running on a 32 bit OS and 64 bit code when running on a 64 bit OS.
Unless you are doing something very funky (which is unlikely in a SharePoint web part) then you should leave it as "Any CPU" and simply not worry about it any more - it will just automagically work.
