Wrong special characters are used

[Jj0YzL5nvJ]

test_cp1252.zip

[Narann]

I'm not sure it's a mupen bug. What happen if you open a terminal in the problematic folder?

[Jj0YzL5nvJ]

https://imgur.com/a/zyP38QL
https://imgur.com/a/5RFNy85

[Jj0YzL5nvJ]

It appears that an unnecessary string conversion is being performed.
https://imgur.com/a/OtmpuZY

mupen64plus/mupen64plus-core#688
loganmc10/m64p#157

Edit:
Sorry, I packed the wrong text file (test2.txt vs hmm.txt).
Fixed - test2.zip

[loganmc10]

I don't think mupen64plus-core really supports Unicode/UTF-8 on Windows.

mupen64plus-core uses fopen (and similar functions). This works for UTF-8 on Linux, however on Windows you need to use _wfopen and pass it a wchar_t/UTF-16 string.

Those functions should be brought into "osal" and have separate implementations for Windows and Linux.