Is code written in Vista 64 compatible on 32 bit os?

I do development on 64 bit machines for 32 bit Windows. It's not a problem. You should make sure that your projects are set to compile in x86 mode in order to be conservative.

You'll want to go through each project in the solution and double check this. You could also use the AnyCPU setting but that's a little riskier since it will run differently on your dev machine than a 32 bit machine. You want to avoid the 64bit mode, of course.

As long as you compile your executables as 32 bit, they will run on both 32 bit and 64 Windows machines (guaranteed). Using 64 dev machines has the advantage that you can start testing your code with 64 bit compilation (to check for things like pointers casted to 32 bit integers), this way making the transition to 64 bit easier in the future (should you your company choose to do a 64 bit version).

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