the dfpug and vfx fll include the original zLib C code - and you have the option to tweak the GUI (which was neccessary, as on oodles of tiny files GUI slowed down processing a LOT).

Changed that, added a property for updating GUI every x files processed.
Hollered long enough to include that into the release - having the source gives you such options and now you can either change or create a subclassed GUI with values set to your needs ;-)

@Christian: If you decide to use Tores mail: Set it to every 20 files at least if not working ALWAYS with multi MB files - 20 is good for small dbf, still to small for .bat, png and small bmp. The C code will run at satisfying speeds ;-))

>>>Indeed this was the first thing that I checked, but both files are in syswow64. Also the library itself does not give an error, the unzip process itself returns .F.
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>You're right, dependency usually produced a compatibility error... even so, can I recommend you put all 3 files msvcp71.dll, msvcr70.dll and msvcr71.dll in the app folder with the VFPcompression.fll and try again? If still broken, obviously you have no choice, but thr prospect of a breakage for unknown cause is alarming for others who presumably also may face this in future...
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>Only other suggestion would be that West Wind libraries include zip/unzip using standard winzip dlls.