A .desktop file for GIMP
I've downloaded the AppImage version of the recently released GIMP 3.0 release. As you may expect, it didn't come with a .desktop file. These files can include file associations so you don't need to manually associate every file a program can handle. After some digging I found the gimp.desktop-file that comes with Arch:
P.S. I'm not on EndeavourOS anymore, I switched to Debian 12 (Bookworm), that's why I use the GIMP's AppImage.