After many difficulties with desktop Turbo tax not being able to resume my 2019 return (couldn't find data, then needed reentry of activation code), I was able to restart by clicking on "File" and my folder which only showed a couple files with ~ in front of the name.  I selected the one with the latest modification date and was able to complete my return and e-file.  When exiting Turbo tax, I saved without indicating the destination, and so it saved to the same ~ file.

My first question, can I rename this file, removing the ~ and still have my 2020 Turbo Tax able to transfer the data, or is there something special internally in the file that would prevent that?  Second question, I noticed now that I have a ~~ (double squiggle) name file in my folder....is that a backup file to the ~ file?  Are both the ~ file and ~~ file identical?