How to recover .tax2018 file

Hello, I am running into a strange issue. I have been using TT for about 10 years now. Somehow my 2018 tax file ( the one with .tax2018 extension) file got saved as a zip file with .tax2018.zip extension. When I unzip the file, I see two files, one is a manifest.xml and the other is a file with long list of numbers and names (example: df402278-cafd-4bb2-bb0d-5f35e0bcf208) but I could not find the actual .tax2018 file. 

 

I have moved between different laptops and restored from my Google Drive back up etc, but I am not sure what exactly caused this .tax2018 file to become .tax2018.zip. I spent quite a bit of time Googling this and also tried contacting TT helpline, but could not find a way to recover the original .tax2018 file. 

 

Does anyone have any suggestions on recovering the file? Thanks for any advice.