The cap is made in 99.6.2 or 6.4 I'm not sure which. It only works with .wav files but I haven't installed a newer version of Construct yet, someone that tests it in a newer version let me know if you can play an mp3 or midi file after loading it.
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Woohoo, I was wrong!
It only plays wave files if you're just doing autoplay file.
If you Play MUSIC from file, it works with mp3 and midi as well.