Test dot path parsing on Windows

[Stebalien]

This:

1. Needs a test. Is it possible to test this on non-windows machines?
2. Needs to be commented.

[djdv]

But if we add tests, how will I pad my commit history?!

Serious:
With the coreapi being a reliable thing now, I'm going to look into designing tests around it that run on the Windows CI.

I'm also going to dedicate some time looking at this again
ipfs/kubo#5224
The building and testing experience on Windows has been pretty well ironed out, but our CI environment needs some refactoring itself.