How to set default script to open file in Ubuntu 18.04 on Gnome GUI?

Question

Gnome

This was in earlier versions of Gnome.

Now at 18.04 I can't run the script to open the file

Answer 1

you can simply create an application shortcut where, among other things, specify the path to your script in the Exec variable, then add the 'shortcut' to the desired folder (/usr/share/applications or /usr/local/share/applications or for the current user ~/.local /share/applications)
After that, this shortcut will be added to the selection of programs to run