I've downloaded the chd file(847jaa11.chd) and the rom bm4thmix.zip of <beatmania 4th mix>.
I put bm4thmix.zip in the rom folder of MAMEoX, and creat a folder named "bm4thmix" in the same rom folder, then put 847jaa11.chd in the new folder.
But when I load the game after reflashing the game list, it just tell me can't find 847jaa11.chd.
But the game works fine with MAME and the same way.
Any idea plz?