>Sergey,
>thanks for the link. In reading the doc below the download link I see what might be the problem. It says:
>If you 'SET LIBRARY TO vfpencryption.fll' in Visual FoxPro and get an error saying that the FLL is invalid, then you (or your client) don't have the required C runtimes installed.
>
>I installed Open Office a few days ago and I'll bet that it installed new C runtimes that overwrote the ones that the old version needed. OK, just a guess but I think better than a 60% chance that's it. What do you think?

I agree that it has something to do with C/C++ runtimes but I doubt that OpenOffice would overwrite them with older version.