Painter 2019 Crashed on save, unable to open resulting tmp file

I was working using painter 2019, went to save my work, it ended up freezing with a grayed "saving to riff format" message, and would not respond to anything. When I opened painter again after that I had lost all my progress since my last save. Theres no bak file, but there is a tmp file, however, trying to open it results in "file cannot be opened". I have also checked the recovered files, and while previous recovered files are still there, there isn't one for this crash. Is there any way to open this tmp file, or is it just lost? Crashes seem quite frequent using P 2019, so im hoping there is a way to recover this still