[Bug 44016] Improve path handling in Open and Save dialogs

https://bugs.winehq.org/show_bug.cgi?id=44016

--- Comment #5 from Austin English  ---
(In reply to KOLANICH from comment #4)
> > - What error does wine give? I paste "C:\windows\system32" in notepad++ open and it works as expected.
>
> In fact I worked with that system a half year ago, I just have recently
> remembered that I had wanted to create a ticket. If it works, it's fine.
> > - I a agree, but I'm not sure if that's planned to be possible.
>
> What's the problem? Wine knows all the mounted windows drives so in the case
> of a rootfs path it can check if any mounted windows drive path is a prefix
> of a rootfs path and then replace.

Wine will map / to Z:\ normally, so you can access files in your file system.
comdlg32 doesn't understand unix paths, and it's doubtful it should. The DLL
can be used on windows, which doesn't support that.

You can use `winepath` to converte unix/windows paths.