Funny enough, it does. Here’s the full list of supported formats. Line 54:

const char FileView::kFileFilter = ".wav *.flac *.wv *.ogg *.oga *.opus *.spx *.ape .mpc " ".mp2 *.mp3 *.m4a *.mp4 *.aac *.asf *.asx .wma " ".aif *.aiff *.mka *.tta *.dsf .dsd " ".cue *.m3u *.m3u8 *.pls *.xspf .asxini " ".ac3 .dts " ".mod *.s3m *.xm .it" ".spc *.vgm";

Although like .spc, it doesn’t support seeking, you have to listen to the whole file in order or restart for the beginning.