The only formats you can use now are uncompressed .wav, .ogg and i believe .flac (might be wrong on the last one) WAV is a VERY universal standardised format, practically any audio converter will convert from some arbitrary format to .Wav, so it would certainly be the path of least resistance to try and find a converter for them. They would still playback and sound the same.
That said, we do have source code for the engine and you can write plug-ins. If you can find some source code for playback of those files, there’s nothing stopping you writing and integrating a plugin yourself, but of course you’ll have to learn C++. I’m fairly certain that there isn’t one around, simply because those formats aren’t really used anymore.