/usr/share/source-highlight/desktop.lang is in libsource-highlight-common 3.1.7-1.
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 | # highlighting for (KDE) desktop files
include "script_comment.lang"
section start '\[.*\]'
(type,paren,normal,symbol) = `([^="\[]+)((?:\[.+\])*)([[:blank:]]*)(=)`
include "number.lang"
include "symbols.lang"
include "c_string.lang"
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