I had a configuration named Makefile which had no association. In the new association dialog it was shown as “*.txt” with unticked checkbox. Now I assigned it to the wildcard:
However, in the Open/Save dialogs it still displays “Makefile (*.txt)”.
Suggestion: remember the column widths in the the Quick Launch dialog. By default they are too narrow, so I have to enlarge them, but next time I open the dialog the witdhs are default again.
Suggestion: make the drop-down path of the Commands listbox in the Configuration->Keyboard wider than the list itself. For example, there’s a screenshot of how this idea is implemented in Total Commander: