[Bug 39678] Zararadio can not read folder/file name path with Latin characters

https://bugs.winehq.org/show_bug.cgi?id=39678

--- Comment #17 from Nikolay Sivov  ---
Created attachment 53135
  --> https://bugs.winehq.org/attachment.cgi?id=53135
patch

After some debugging, this call fails:

---
0009:trace:msvcrt:MSVCRT_vsscanf_l "file0=D:\M\xdaSICA RADIO
CONDELL\JJPG\FOLKLORE\100 MEJORES DEL FOLKLORE - IRT\100 MEJORES DEL
FOLKLORE - IRT - CD 4\100 MEJORES DEL FOLKLORE - IRT - CD4 - 25 - LOS DE
RAM\xd3N - V\xe1monos emborrachando.mp3\n" ("%[^=] = %[^;]")
---

Specifically second format mask.

The problem seems to be signed char to signed int propagation that happens at
some point - _GETC_ returns 0xffffffda for \xda char, then it's passed to
RtlAreBitsClear() as ULONG, and this obviously fails. Hacking for this specific
char value to drop higher bits makes it work.

You can try this patch if you like.