On Mac it is in a different place, so I presume it is on PC too.
Mac location:
user
/Library/Application Support/Graphisoft/TW Data/
YourProjectName
/Autosave
HTH
Regards, Geoff Briggs
I & I Design, Seattle, USA
AC7-29, M1 Mac, OS Tahoe
Graphisoft Insider's Panel, Beta Tester