As a note... Even if you don't know the original person who wrote it, if you received it from somewhere or know where it's being used, they may have the answers for you.
Are you receiving error messages or anything that would hint at the problem? Unless it's using DLLs or COM, it *probably* has nothing to do with what version of Windows you are using.
If you can describe the actual problem you're having with it, it might help to track down what's happening.
