This file is indexed.

/usr/share/kde4/services/apt+http.protocol is in apturl-common 0.5.2ubuntu11.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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[Protocol]
exec=apturl %u
protocol=apt+http
input=none
output=none
helper=true
listing=false
reading=false
writing=false
makedir=false
deleting=false
Icon=application-x-deb
Class=:local