“Open with…” with multiple files

On Linux there is a standard related with desktop interactions and configuration. The standard describes, among other things, .desktop files. Important thing to remember when editing these files by hand (as I have done recently) is that when you want to pass multiple files as an argument to an app in “Exec” line, you have to give %F as an argument, like so:

Exec=coolapp %F

See The Exec key on standards.freedesktop.org.