/usr/share/services/mumble.protocol is in mumble 1.2.19-1ubuntu1.
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 | [Protocol]
exec=mumble %u
protocol=mumble
input=none
output=none
Icon=mumble
helper=true
Description=A low-latency, high quality voice chat program for gaming
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