>>There is your answer. The .PRG file is the source and the .FXP file is the compiled (object) code. .PRGs can't be compiled at runtime; they require the development environment.
>
>If this is true, why does it work on Windows 95? When I move the files to the NT server, I get the error. I am using the same machine when I run the program on Windows 95 and the server.

Probably you have the fxp somewhere in the path, because Bryan Jackson is right: you can't compile from an exe.

> Here is something which I found to be weird. In my EXE I put the following lines:
>
>=MESSAGEBOX(IIF(FILE("test.prg"), "True", "False"))
>DO Test.prg
>
>The messagebox display True, but the next line give an error: "unable to find test.prg".

This is because it can't compile and so it can't find the fxp file. Sure, the error message is not correct.

Vlad