/usr/share/kde4/services/metainfo.protocol is in kdelibs5-data 4:4.13.3-0ubuntu0.5.
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 | [Protocol]
exec=kio_metainfo
protocol=metainfo
input=stream
output=stream
reading=true
writing=true
source=false
Icon=help-about
|