Fabby
8
Please read this:
Please boot a Manjaro USB stick and execute as root:
fsck /dev/sdc1
fsck /dev/sdc2
fsck /dev/sda1
fsck /dev/sda2
When you encounter an error, look up the exact error message on your phone / another computer and fix it.
Once done, shut down, remove the USB stick and boot normally
Perform the xdg-open
again on the same file. If that works flawlessly, try your other applications too.