From https://bugs.launchpad.net/catfish-search/+bug/1760419 I've set an appImage to chmod +x and when I search and find it within catfish, clicking on it won't invoke the program. Catfish v1.4.4 System: Kernel: 4.15.13-1-MANJARO x86_64 bits: 64 compiler: gcc v: 7.3.1 Desktop: Xfce 4.12.4 (Gtk 2.24.31) Distro: Manjaro Linux 17.1.7 Hakoila
Sean Davis referenced this bugreport in commit 9198dafad1216dff4b78fb2992bc7c5414bd3db0 Enable launching executable AppImage files from Catfish (bug #14500) https://git.xfce.org/apps/catfish/commit?id=9198dafad1216dff4b78fb2992bc7c5414bd3db0
Fixed in the above commit.