/usr/share/app-install/desktop/jnoisemeter:jnoisemeter.desktop is in app-install-data 0.12.04.4.
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 | [Desktop Entry]
X-AppInstall-Package=jnoisemeter
X-AppInstall-Popcon=0
X-AppInstall-Section=universe
Type=Application
Name=Jnoisemeter
GenericName=Audio test signals meter
Comment=Audio test signals meter for JACK
Icon=jnoisemeter_32x32
Exec=jnoisemeter
Terminal=false
Categories=AudioVideo;Audio;
X-Ubuntu-Gettext-Domain=app-install-data
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