dont worry, is the same with me. when displayed on the computer, the roland styles are seen as CTL, but they are just OK.
you can not open a style file only with notepad or something similar - does not make sense.
but you can load them in your keyboard and they will work fine.
_________________________
Yamaha S770, Studio One 3, EMU 0404USB, ESI, ATH, Dell. And others.