I have a main.prg with a RETURN in it. The DLL initally worked (didn't crash at least) on my machine, but not on any others. This is why I had to register the DLL. FoxPro registers it on the development machine if you choose "Recreate OLE Server IDs" from the build dialog. But that doesn't cut it on client machines. Thanks for the input. Any more ideas? Anyone? :-)