Ew. Yeah no clue, don't really do windows (especially not building stuff there; if I do I use cygwin which is back to *NIX-y stuff). Did find https://github.com/nscaife/file-windows which looks to maybe be a port of the library that has a DLL version (which would be what you'd need on wintendo rather than an shared object ".so" file) but . . . /shrug

So yeah Mail::Box may be the simpler route at this point if it installs cleaner for you.