Trouble with .sdf music files

Hey,

I was wondering if anyone would be kind enough to help me open some Touhou sheet music. I downloaded a bunch recently and they were all in .sdf format. I downloaded (and clicked my way through registering) Kawaii Score Player FX. However, the newest version no longer recognizes .sdf files and can only open .sdx

Does anyone have a setup for an older version of Kawaii Score Player FX? Or can tell me if there's another program that I can use to see them music?