/usr/share/applications/wxmaxima.desktop is in wxmaxima 13.04.2-4+deb8u1.
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 | [Desktop Entry]
Name=wxMaxima
Comment=Perform symbolic and numeric calculations using Maxima
Exec=wxmaxima %f
Icon=/usr/share/wxMaxima/wxmaxima.png
Terminal=false
Type=Application
Categories=Education;Science;Math;X-Red-Hat-Base;X-Red-Hat-Base-Only;
MimeType=text/x-wxmaxima-batch;
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