>>>It has dependency on VC++ runtime library msvcr71.dll and msvcp71.dll
>>>
>>>>Any guesses why I would be getting the following error message?
>>>>
>>>>Library file z:\applications\programs 9.0\vfpcompression.fll is invalid.
>>>>
>>>>What's interesting here is that when I use Citrix to connect to the server, I can use that fll without any problems; however, the background task running on that server fails with the message above.
>>>>
>>>>Thanks
>>
>>The fll and both of those dlls are all in the same directory (which is the current directory)
>
>Unless z: is a physical drive local to the machine running the scheduled task, try using a UNC instead.
>
>Make sure the account under which the scheduled task runs has sufficient privileges.
>
>I have seen some weird effects with the working directory setting in scheduled tasks. I just found some related info at http://superuser.com/questions/622507/windows-task-scheduler-wont-run-file-on-non-system-drive .

Most interesting. Using the UNC would be necessary ONLY for the case of using Set Library To? The scheduled tasks have been running for years with no other problems (and never using UNCs).

I also don't know what "sufficient privileges" means in this case.