/usr/share/applications/texmacs.desktop is in texmacs-common 1:1.0.7.18-1.
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 12 13 | [Desktop Entry]
Version=1.0
Encoding=UTF-8
Name=GNU TeXmacs Editor
GenericName=TeXmacs Editor
Comment=A structured wysiwyg scientific text editor
MimeType=text/x-texmacs;text/plain;text/x-tex;
Exec=texmacs %f
Icon=TeXmacs
Path=
Type=Application
Terminal=false
Categories=Application;Science;Utility;
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