Special Character issues

Description

When loading a content, the path of the content can't have any special character in it.

Expected behavior

-Launching the game properly, handling special characters (or basics special character like "é")

or

-Displaying an error about the path of the rom/ File not found or something to know where the error comes from

Actual behavior

RetroArch display an error "Failed to load content", leading to a lot of possible errors.

Steps to reproduce the bug

1. Have the rom in a path that include a special character ("é" char in my case)
2. Load a core (Desmume in my case)
3. load a content (.nds USA rom in my case)

(Also, having RetroArch in a path that include a special character may cause some other problem maybe. I haven't verified this, my RetroArch isn't in the same folder)

Bisect Results

As soon i installed it

Version/Commit

Git Version : c73daa6a1c

Environment information

• OS: Windows 10 64 Bits

Reproduce the failure on Windows 10 with RetroArch and a .nds ROM whose path contains a character such as "é", using the reported core-loading steps. Trace content loading from the reported "Failed to load content" result, then verify that such paths either load successfully or produce an error identifying the ROM path problem.