Hello!
I also wanted to jump into this discussion and share how you can find temp files if you encounter a corrupted project!
Here are the steps:
1) Open this folder in Windows Explorer: %appdata%\Articulate\Storyline
2) Scan the contents of this folder for a file that starts with the name of your project. If you find one, copy it to your desktop. If you find more than one, copy the latest version to your desktop.
3) Change the file extension of the copy on your desktop from *.tmp to *.story.
4) Double-click the file to open it in Storyline.