Hello,
I do realize that this crate is currently only compatible with the XDG specification, as stated in the readme. But for all of folders defined in the specification, one can find and query equivalent Windows environment variables, which can serve as a fallback on Windows systems. This is how the equivalent Haskell library goes about the problem of cross-platform support.

I'm going to do these changes on a fork of this repo anyways since I do need them for an application of mine, so would those patches be welcome here, or is Windows support a non-goal?

Cheers,
Katharina