Was having an issue in windows 7 (64 bit) with openzone 8.3 -
It wasn't saving worlds after clicking save, OZ would always
(at some point) give an access violation thus killing hours of work,
occasionally- upon looking at the files it was identified that it was just saving
them as regular old files (no extension at all, just file) - after putting ".scn" on the
back and boom they work - just need to save and put that extension on the back if
you ever have a similar issue. Not sure what is causing it to not save .scn right.