>Occasionally I get an error 'Cannot create file c:\whatever\whatever.fxp'. Commands like CLEAR ALL and CLEAR PROGRAM don't help. Also, the fxp-file cannot be deleted. The only thing that seems to help is to QUIT VFP and then restart.
>
>Who knows the cause?

Are you using a version prior to VFP7?

VFP7 contains the fix for a similar bug which occurs in previous VFP versions.