>After running service pack 4, I checked the version numbers of VFP6t.dll, VFP6r.dll, VFP6renu.dll and all are higher than old ones
>after SP3. The VFP6run.exe is the same.
>
>Do these files need to be distributed to our customers running our EXE ?

Yes. Create a dummy install with no project files, but ensure you include the VFP runtime files.