/usr/share/applications/org.thonny.Thonny.desktop is in thonny 2.1.16-3.
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 14 15 16 17 | [Desktop Entry]
Type=Application
Name=Thonny
GenericName=Python IDE
Exec=/usr/bin/thonny %F
Comment=Python IDE for beginners
Icon=thonny
StartupWMClass=Thonny
Terminal=false
Categories=Education;Development
Keywords=programming;education
MimeType=text/x-python;
Actions=Edit;
[Desktop Action Edit]
Exec=/usr/bin/thonny %F
Name=Edit with Thonny
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