/usr/share/applications/dspdfviewer.desktop is in dspdfviewer 1.15.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Type=Application
Version=1.0
Name=DS PDF Viewer
Comment=Dual-Screen PDF Viewer for LaTeX-Beamer presentations utilizing the "show notes on second screen" option
Keywords=pdf;presentation;latex;beamer;notes;
Exec=dspdfviewer %f
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