Problem with folders and special-characters

RetroArch: RetroArch 1.6.7
Core: PPSSPP 1.4.2-git

The new PPSSPP core has problems reading from folders with special characters.

RetroArch can read and write OK from folder with specials chars, for example:
C:\Emulación\RetroArch\saves

Cores can perform in-game saves, RetroArch can do saves-states and can detect required files (bios, etc.) and show "OK" in core information.

But PPSSPP, in this path, has problems.
It can't load the assets (stored in C:\Emulación\RetroArch/system/PPSSPP). If you move the folder to C:\RetroArch then it works and can be loaded.
It can't load/save the memory cards. It creates a parallel C:\Emulaci�n\RetroArch\save structure (note the difference C:\Emulación vs C:\Emulaci�n).