In general, you can name the files whichever way you want, but you must follow one rule: there must be a BIN number in the name, and it must be preceded by an underscore character ('_'). Also, the filenames CANNOT be longer than 63 characters.
Examples of correctly named files:
unknown_317.bin
goalnet_41.bin
ball_9.bin
unknow_9 (.bin extension is optional)
music_11.adx (a file can have a different extension: .adx is typically used for music and sound files)
Examples of incorrectly named files:
unnamed10.bin - no underscore symbol before the BIN number.
face.bin - no BIN number.
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