Mark, Stan,

I'm a TYROSII owner also. I never used the XF file format,
but I know its apart of the Yamaha XG midi format implemented widely on nearly all Yamaha keyboards to display lyrics, chords, and notes.
I think its very usefull to add this function to Composer, for Yamaha Key's owners.

However Yamaha also supports the Karaoke format which displays on the TYROS (and most other keys) screen also notes, lyrics and chords. I have either not tested files in Karaoke (*.kar) format saved by Notation Composer. Have you tried that already.

I also know many TYROS users use dump midi files coupled with specific files to display their musical notes etc on the TYROS screen. You may search the specific TYROS forums for details and support.

Cheers Jaap