ok first off to answer my own question, yes encore 1.0 files can be opened in encore CS3.
i know JeffB said to finish off my projects but i just wanted to see if CS3 would open and i could finish of my projects.
i was making a dvd for a mate of his holiday snaps, (i put it in premiere pro and made a movie with a soundtrack for each country he visited - it was a contiki trip thru europe).
any way there were a few gliches in encore 1.0 with the project and i had hoped (with fingers and toes crossed) that i could just open it up in CS3 and the gliches would disappear - cos i was certain i had authored it correctly, and yes the gliches were sorted out.
one of the gliches i had in encore 1.0 when making the project, there was an error in playback when previewing the project, (a button wasnt going to the right link on a menu screen) anyway, so i clicked on the button and used the pick n whip (i think its still called that) and linked it to the menu, then in the properties part selected the link on the menu that i wanted to be highlighted. But the button changed name to 'picture menu' from 'back' but the easy fix was just to rename it in the properties box - so easy, i thought i was gonna have to make a new button and edit them in photoshop etc.
anyway point im making is it will open ur old files and u can continue to finish them off.
now i cant wait to see what other new features are in CS3.
cya
Dan