Hello GunnarTorres,
Good day! I'm John Dev a Windows user like you and I'll be happy to assist you today. I know this has been difficult for you, Rest assured, I'm going to do my best to help you.
Please try the method below if it helps.
Open File Explorer
Click the View tab then check the box "File name Extensions"
After that, close File Explorer
Right-click on an empty space on your Desktop
Select New > Text Document
Right click the Text file then select rename
Change the file extension from .txt to .exe
Click Yes to confirm the change
Right click the .sav file, Choose open with > Choose another app
Make sure to check the box "Always use this app to open .sav file"
Click More Apps then scroll at the bottom and select "Look for another app on this PC"
Find and select the dummy exe file on your Desktop and click Ok
It will not open and this is expected
Delete the dummy exe file and safely restart your computer
Check if the issue is resolved
Kindly let me know if this helps or if you have any further concerns.
Kind regards,
John DeV
Independent Advisor