Vista 64 Jet.Oledb.4.0

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What is the best way to compile projects using Vista 64, VS 2005, that
were originally compiled on XP?

If your programs use the JET Engine, you will need to compile them for
"x86" instead of "Any CPU". This is necessary because the "Any CPU" programs
will try to run in 64 bits under Vista 64, but they will fail when calling
into the JET DLLs because there is only a 32 bit version of those libraries.