GC/EUR/IPL.bin fell through to its bare name and the union of five regions, so a Batocera or standalone Dolphin pack never reduced it. The GameCube IPLs of four Dolphin-family profiles now name their system, as the MMJR profiles do.
Dolphin and its forks hash dsp_rom.bin and dsp_coef.bin together and
warn on any combination outside known_roms. The profiles now carry the
accepted pairs, and the resolver keeps both files inside the first pair
the collection holds whole: MMJR and Ishiiruka were served the free ROM
beside the official coefficients.
Dolphin files the Australian country code under Region::PAL, whose
IPL lives in GC/EUR. Tagged europe alone, --region australia dropped
it and kept the American IPL, which Dolphin never reads for those
discs.
Abdessamad Derraz