>Hi,
>
>I tried to build a dll separately so that I can change it whenever I like and send only new dll to my client after customisation, rather than sending complete new exe.
>
>This dll will be run from my old EXE.
>
>I get some wierd errors in spite of following the VFP5 manual.
>
>There are no sources available to try it out.
>
>Has anyone done similar thing and succeeded???

What exactly do you want to replace in the application as far as functionality? A VFP .DLL is used to create an in-process OLE Server; if it is not simple replacement of a COM object without user interface components, a VFP-created OLE Server will not do what you need.