This file is indexed.

/usr/share/kservices5/xz.protocol is in kio-extras-data 4:17.12.3-0ubuntu2.

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=kf5/kio/filter
protocol=xz
archiveMimetype=application/x-xz
determineMimetypeFromExtension=false
input=stream
output=stream
reading=true
source=false
X-DocPath=kioslave5/xz/index.html
Icon=package-x-generic