Comment # 1 on bug 1215219 from Andreas Stieger

https://bugs.freedesktop.org/show_bug.cgi?id=108975
https://gitlab.freedesktop.org/xdg/xdg-utils/-/issues/140
https://gitlab.freedesktop.org/xdg/xdg-utils/-/merge_requests/37/diffs?commit_id=d9e547b64b738ecb53dfb3497842500b8f6368b9

Calling wslpath on a URL won't work:

$ wslpath -w "https://www.example.com/"
https\www.example.com\

[sic]