So I was looking for some kind of Ulauncher functionality (file/directory search) and direct url opening from rofi or dmenu and I found dmenu-extended, but I doesn’t work at all for me and maybe someone more experienced can help me with this.

My first problem is that I cannot make nomacs the default image viewer with dmenu_extended, although the default image viewer in my system is nomacs, when I open any file image with dmenu_extended, it always open it with some basic image viewer but not with nomacs, to launch it with nomacs I need to first type ‘nomacs:’ and then the file route.

And other problem that I’m facing is that when I try to open Steam (installed as a flatpak) it never opens, instead gives me this error message:

xdg-open: file ‘/usr/bin/flatpak run --branch=stable --arch=x86_64 --command=/app/bin/steam --file-forwarding com.valvesoftware.Steam @@u’ does not exist