i just made a folder in ux0:/data GBA ROMS ... & it worked...
That's one little thing that annoys me, isn't there an option to like set a specific folder to be opened whenever I boot up the app instead of having to browse each time for the ROMs?mGBA should recognize .gba just fine, as well as .zip and .7z IIRC.
It also doesn't matter what folder you put them in, mGBA should open up with a file browser so you can just go to whatever directory you want.
I know there's an option for save files:There might be a way to set the default path in the config.ini in the MGBA folder, however I'm not aware of any myself. You could probably mess around with the config, try and see if you can figure out how to set the default path.
savegamePath=sd:/mGBA/saves/
savegamePath=
savestatePath=
screenshotPath=
patchPath=