USB Loader GX can see other games, just not SSBB.
auto
Update, I fixed my computer, and this is the file path.
F:\wbfs\Super Smash Bros. Brawl [RSBE01]
The game is .wbfs, but I had it as .iso before and it still didn't work.
The name of the .wbfs is "Super Smash Bros. Brawl.wbfs"
Update 2...