linux: edit game properties + shader cache

[leolam]

That means the wrong editor is associated with the .ini extension (that's XDG stuff).

Just launch Kate manually with the path to the config file (/home/jo/.local/share/dolphin-emu/GameSettings/RMCP01.ini).

For the cache directory, Dolphin follows the XDG basedir spec. So cache files should be in ~/.cache/dolphin-emu, I think.