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I have a very simple DLL written in unmanaged C++ that I access from my application. I recently switch to Visual Studio 2010, and the DLL went from 55k down to 35k with no code changes, and now it will no longer load in Windows 2000. I didn’t change any code or compiler settings. I have my defines setup for 0x0500, which should include Windows 2000 support. Has anyone else run into this, or have any ideas of what I can do?
Visual Studio 2010 cannot build binaries that run on Windows 2000. It’s actually even worse than that, they won’t run on Windows XP RTM or Windows XP Service Pack 1 either. This is because VS2010’s C runtime library requires the EncodePointer API which is not available until SP2.
It appears you’re stuck building with installing VS2008 if you want to support earlier versions of Windows. You can either move your entire project to Visual Studio 2008 or you can target the vc90 (Visual Studio 2008) toolset from within your Visual Studio 2010 projects. For more details on the latter method, see this anwser to my related question here.