/usr/lib/rpm/fileattrs/desktop.attr is in rpm 4.12.0.2+dfsg1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | %__desktop_provides %{_rpmconfigdir}/desktop-file.prov
%__desktop_path ^%{_datadir}/applications/.*\\.desktop$
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