mmm I have indeed stumbled
I don't seem to be able to get the "Start Frotz" to show in KUAL, I'm guessing it's a directory structure fault on my part, I didn't have folders named "/mnt/us" on the root dir of my UK Kindle PW so I created my own, My dir structure is>
/mnt/us/bin/
/extensions/frotz/bin/
/if/Planetfa.z3
Don't know why I haven't got "/mnt/us" by default on my kindle pw ?