I am unable to open txt files I created a month ago using the same computer and the same OS.
The the major changes I made were moving most of my files from the internal hard drive to an external backup.
And moving most of these files into a veracrypt volume.
Now I get the message shown on the screenshot
Though I created these files as txt, they now have no extensions and adding a .txt does not make them openable.
None of the applications in the "open with" list work.
Any suggestions appreciated.