I've been working on a file for a few weeks now and I was literally trying to send a press PDF to print when InDesign crashed. I always keep backups but with this one I lost about 9 hours of work. I've tried changing to .IDML and opening on windows, and a few other tricks, to no avail. Anyone have any good info on how to save this file? Any help here would be much appreciated.
Changing suffix to IDML will not change the file, it remains the same. To create an IDML you have to save it.
You have to go to your last backup file, nothing else you could do.
If you work on a cloud space, like DropBox, you could recover an older version (if you saved regularly).
BTW: You should not create PDFs via printing, export them.