>In the Projects tab in VFP, you can set up a source control
>provider.
>
>Anyone know how to hook into VFP if you wanted to use your
>own source control software.
>
>I'd like to show files as checked in, checked out, etc.

I'd suggest looking into using project manager hooks. The QueryModifyFile() method of the ProjectHook object would be specifically what you're looking for.

Also, while you're fishing around in the MSDN, do a search on "happy project hooker" for Doug Hennig's article on the subject.