/usr/share/kservices5/mmsu.protocol is in kio 5.44.0-0ubuntu1.
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=
protocol=mmsu
input=none
output=none
helper=true
listing=
reading=false
writing=false
makedir=false
deleting=false
Icon=www
Class=:internet
URIMode=url
|