>I am using the same code for two different versions of VFP. It would be great if I could check to be sure I've recompiled the code when switching from one version to the other. How does one determine the VFP version used to compile a .PRG for instance?

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See aGetFileVersion().

If you use Visual SourceSafe (VSS), it has the ability of embedding the VSS revision number within your files, I use it to place the revision number in the comment property of classes and forms (as well as the top of prgs). I have a function kicked off by a hotkey, which displays the module's revision number (very useful, for determining if a module contains a fix)...