fix: create and write write cache windows compatibility

[dekaravanhoc]

Hey,

as per #68 I fixed the cache generation to also work on windows using native vim functions.

The stdin problem was solved by cspell, so everything works for me with these changes here. :)

[davidmh]

My bad @dekaravanhoc, I was trying to push a conflict resolution and a test into your branch, but the gh cli may have made things a bit too complicated. I've pushed your commit and the test to the main branch, thanks!