/usr/share/kde4/services/ar.protocol is in kde-runtime-data 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 | [Protocol]
exec=kio_archive
protocol=ar
archiveMimetype=application/x-archive
input=filesystem
output=filesystem
listing=Name,Type,Size,Date,Access,Owner,Group,Link
reading=true
source=true
Icon=package-x-generic
Class=:local
|