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86910f406e
In std::string, you can store strings using any encoding, but in Dolphin we have decided to use UTF-8. The problem is that if you convert between std::string and std::filesystem::path using the built-in methods, the standard library will make up its own assumption of what encoding you're using in the std::string. On most OSes this is UTF-8, but on Windows it's whatever the user's code page is. What I believe is the C++ standard authors' intended solution to this is to use std::u8string instead of std::string, but that's a big hassle to move over to, because there's no convenient way to convert between std::string and std::u8string. Instead, in Dolphin, we have added helper functions that convert between std::string and std::filesystem::path in the manner we want. You *always* have to use these when converting between std::string and std::filesystem::path, otherwise we get these kinds of encoding problems that we've been having with custom textures. Fixes https://bugs.dolphin-emu.org/issues/13328.