/usr/share/kde4/services/apt.protocol is in apturl-common 0.5.2ubuntu4.
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 | [Protocol]
exec=apturl %u
protocol=apt
input=none
output=none
helper=true
listing=false
reading=false
writing=false
makedir=false
deleting=false
Icon=application-x-deb
Class=:local
|