invalid encoding files on home directory

Retro arch is creating files in my home directory, with the name contaning invalid encoding characteres.
im not completely sure if that is a bug on one of the cores, or in retroarch itself.
the files are named something like:
���0 (codificação inválida)

(my system is in portuguese, codificação inválida means invalid encoding)

it took me a while to notice what program was creating such files since many of then are empty, but looking at some non empty files i got data that seems to come from retroarch:

[Logs]
ActionReplay = False
AI = False
Audio = False
BOOT = True

in one of the files and:

[Enhancements]
ForceFiltering = False
MaxAnisotropy = 0
[Hacks]
BBoxEnable = False

in another.

i have both snap and steam versions installed.

• Snap - RetroArch: git version: 938ab716bd
  Buid date: Mar 10 2023
  Steam - Retro Arch: git version: 6616b807ed
  Build date: 17 march 2023

• OS: Ubuntu 20.04
  those files with strange names appear on;

~
and
~/.local/share/Steam/steamapps/common/RetroArch

Reproduce the issue on Ubuntu 20.04 with the Snap and Steam versions, then inspect the invalidly named files in ~ and ~/.local/share/Steam/steamapps/common/RetroArch. Done means identifying whether RetroArch or a core creates these files and preventing creation of filenames with invalid encoding characters.