I quite a guess that some text similar text in this attachment (e.g. copy/paste action from MS Teams) is triggering also that catastrophic bug others are writing about - where file gets corrupted completely. We can see that even Microsoft NotePad can not handle that file correctly.
-- <https://forum.pspad.com/read.php?4,78776,78785> PSPad freeware editor https://www.pspad.com
