PL/SQL Developer Tilde Files

I have noticed that PL/SQL Developer creates a temporary "working" file with a tilde added into the extension. For example editing file something.sql will result in a corresponding something.~sql file being created. I was wondering two things.

1. What is the purpose of this file?
2. Why doesn't PL/SQL Developer clean them up when I close the program or close a file.

Thanks.
 
These files are backups of the previous version before you saved the file. Go to Tools > Preferences > Files / Backup to configure these backups.
 
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