/usr/share/ubuntustudio/applications/hexter.desktop is in ubuntustudio-default-settings 0.54.
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 | [Desktop Entry]
Name=Hexter
Comment=Yamaha DX7 modeling DSSI plugin
Exec=jack-dssi-host hexter.so
Icon=hexter
Terminal=false
Type=Application
Categories=GNOME;AudioVideo;Audio;X-Synthesis;
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