/usr/share/kservices5/programs.protocol is in plasma-workspace 4:5.12.4-0ubuntu3.
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 15 | [Protocol]
exec=kio_applications
protocol=programs
input=none
output=filesystem
listing=Name,Type,Size,Date,Access,Owner,Group,Link,
reading=true
writing=false
makedir=false
deleting=false
linking=false
moving=false
Icon=start-here-kde
maxInstances=2
Class=:local
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