>I am having problem that error 'REGEXP'.prg does not exist when run my application. The error occurred at the line of code SET LIBRARY TO REGEXP ADDITIVE.
>
>I have placed regexp.fll under app root folder and VC++ under microsoft*** folder.
>
>It is working fine in our development and testing environment. It also working fine under some of the machine at customer site.

Just as a wild guess, is it possible that you don't have the correct VC++ files? That should give an "invalid fll" error instead of a "does not exist error", but...

Craig Boyd talks about the runtime location issues here.