>>>Hello,
>>>
>>>I get an error with VFPCompression.fll, one some computers it does not recognize the fll:
>>>
>>>

>>>IF NOT "VFPCOMPRESSION" $ UPPER(SET("Library"))
>>>	SET LIBRARY TO Bin\VfpCompression.fll ADDITIVE
>>>ENDIF
>>>UNZIPQUICK(File,Target) &&give an error "File unzipquick.prg does not exist.
>>>

>>>
>>>On other computers it works, so I wonder if it misses some dll files?
>>
>>Download Dependency Walker (it is free) and open this fll on the computer where you get error.
>
>That was a great idea, the file that was missing was msvcp71.dll.

Usually your application should bomb with error like "Invalid FLL.." or something like this, at the time you SET LIBRARY TO.
Maybe you have some error routine that hides this error?