Tony, the only .sty files are Yamaha format, which can be opened using a number of free programs. They can also be opened using Windows Media Player, but in order to hear them correctly, they need to utilize the keyboard's sound engine - at least that has been my experience.
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)