This file is indexed.

/usr/share/kde4/services/file.protocol is in kdelibs5-data 4:4.14.26-2.

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=kio_file
protocol=file
Icon=folder
input=none
output=filesystem
listing=Name,Type,Size,Date,AccessDate,Access,Owner,Group,Link
reading=true
writing=true
makedir=true
deleting=true
linking=true
moving=true
opening=true
deleteRecursive=true
maxInstances=5
X-DocPath=kioslave/file/index.html
Class=:local