/usr/share/applications/ardour.desktop is in ardour 1:2.8.16+git20131003+dfsg1-1~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 10 11 | [Desktop Entry]
Version=1.0
Name=Ardour Digital Audio Workstation
Comment=Record, mix and master multi-track audio
Keywords=audio;sound;jackd;DAW;multitrack;ladspa;lv2;
Exec=/usr/bin/ardour2 %U
Terminal=false
Type=Application
Icon=/usr/share/ardour2/icons/ardour_icon_22px.png
Categories=AudioVideo;Audio;
MimeType=application/x-ardour;
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