No, there are files with those names, but they won't help for a Clipper application. Clipper applications are 16 bit MS-DOS applications, they will require the 16 bit versions of those files that shpped with SQL 4.21a.
The quickest way to get those files is probably to open a support incident with Microsoft. If you run into any trouble getting the Microsoft support folks to understand what you need, let me know the SR number and I'll call in to explain it for you.
True, but that is for a network topology that has been dead for more than a decade... The company that created/used it has been bought up and dismantled.
If you truly need support for Pathworks, you have real problems because SQL Server hasn't supported that since at least version 6.5, and probably earlier than that. I know that Microsoft doesn't support it, and I seriously doubt that anyone else does.