My Adobe Reader DC recently crashed with lots of comments added in the PDF. After restart and confirming to recover the last file, it just said "Error reading file" and the changes seem to be gone completely now.
I wish i would have saved away the AutoSave directory before restarting.
Where does Adobe Acrobat Reader save/store the temporary files of the "Select Automatically Save Document Changes To Temporary File Every xx Minutes"?
Win XP : C:\Documents and Settings\username\Application Data\Adobe\Acrobat\1X.0\AutoSave
Win 7/8/10: C:\Users\[username]\AppData\Roaming\Adobe\Acrobat\[Version]\AutoSave
The files are just named xx.tmp