Pretty much what the title says: If you are working with a quest file from an earlier build, the timed save doesn't recognize this, and goes along with its business. Then, it corrupts both the backup file's header and quest, where it doesn't work with the original build it was created.
.qst file. Created in 704, but now only works in 735.
1stnewclas.qst - 0.15MB
.qt file. If you can, try to fix the header where it can be read in 735. There's a few custom Subscreen elements and palettes that I'd like to be saved...
1stnewclas.qt2 - 1.07MB
