>This may not be the definitive answer but here goes... I just tried compiling a "Hello world" program in FPW 2.5 and VFP 6. In this case the first three bytes were the same but the fourth byte in the 2.5 version was "0xFF" (hex) and in the 6 version it was "0x20".
>
>For the most part the bytes are the same with the 6.0 version adding several bytes (mostly zeroes) but missing one byte that the 2.5 version had.
>
>I don't know if this helps but maybe you can check the same way for VFP 7 and 8 (I don't have these versions).

Using a file comparison I can see differences in Fox 2.6, VFP5, VFP6 but I can see no difference between VFP 6 and VFP8. I don't have VFP 7. So I will have to come up with some other work around.

Thanks for your help.