/usr/share/app-install/desktop/sonic-visualiser:x-sonicvisualiser-layer.desktop is in app-install-data 14.04.0.
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]
X-AppInstall-Package=sonic-visualiser
X-AppInstall-Popcon=14
X-AppInstall-Section=universe
Command=Sonic Visualiser layer file
Hidden=false
MimeType=application/x-sonicvisualiser-layer
Patterns=*.svl;*.SVL
Icon=sv-icon
Type=MimeType
X-Ubuntu-Gettext-Domain=app-install-data
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