Ever since installing Bless Hex Editor, all unknown files and text files automatically open with Bless instead of gedit. How do I change it back? I don't want to have to manually associate files with gedit, I just want gedit to be the default if there's no other application set up to open the file.

Solution:

modify ~/.local/share/applications/mimeapps.list

[Default Applications] 

- text/plain=bless.desktop

- application/octet-stream=bless.desktop

+ application/octet-stream=gedit.desktop