Hi Sergey
Thank you .You always suggest the best clue.
It depends on Kernel32.dll and MSVCR71.dll then i copy MSVCR71.dll file and that solved my problem and fll works perfectly.

>Get Dependency Walker from http://www.dependencywalker.com/ and check if any DLLs it depends on are missing
>
>>Hi Sergey
>>I installed but still i have the same problem.
>>
>>>Try to download and install Microsoft Visual C++ 2005 SP1 Redistributable Package (x86) on the PC.
>>>
>>>>i use vfpcompression.fll in my applications.it works perfect but in some windows (XP SP1 or SP2) when i call
>>>>Set Library to vfpcompression.fll
>>>>i got error : Library file d:\program files\binyaz programs\bsmsm\vfpcompression.fll is invalid.
>>>>I also copy the needed files (msvcm80.dll,msvcp80.dll,msvcr80.dll,Microsoft.VC80.CRT.manifest) in my application setup.