I havn't tried this in a while so...
Find the Autosave folder (Options Menu/Work Enironment/Data Safety)
Look inside that folder for a big file, something like "@Global.T"
Give it a .PLN extension and try and open it with Archicad.
David Pacifico, RA
AC27 iMac i9, 32 gig Ram, 8 gig video Ram