/usr/share/kde4/services/mbox.protocol is in kdepimlibs-kio-plugins 4:4.8.2-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | [Protocol]
exec=kio_mbox
protocol=mbox
input=none
output=filesystem
listing=Name,Type,Size
reading=true
writing=false
makedir=false
deleting=false
Icon=mail-folder-inbox
maxInstances=2
X-DocPath=kioslave/mbox/index.html
Class=:local
|