>>>>Where should I place the fll in order for this to work correctly?
>>>>
>>>>We put fll in Data directory, but it's not working.
>>>
>>>I always place program related files in the same directory as my program, or in a BIN subdirectory. Make sure that the BIN directory is in the SET PATH setting.
>>
>>In other words, the program can copy FLL from Data folder to the application folder, correct?
>>
>>I'll try that approach.
>
>Sorry, but I don't understand what you mean.

Our program in in Windows/Program FIles\Our App directory on each local PC. I can put fll in the Data folder (on the network) and first time before using copy it to the application folder. Would this approach work?

We manually put the fll in application folder on the local PC and it worked.