/usr/share/app-install/desktop/desktop-webmail:desktop-webmail.desktop is in app-install-data 15.10.
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 18 19 20 21 22 23 24 25 | [Desktop Entry]
X-AppInstall-Package=desktop-webmail
X-AppInstall-Popcon=24
X-AppInstall-Section=universe
Encoding=UTF-8
Name=Desktop Webmail
GenericName=Email
Comment=Compose email in browser
Exec=desktop-webmail %U
Icon=desktop-webmail
Terminal=false
Type=Application
StartupNotify=true
Categories=Application;Network;Email
MimeType=x-scheme-handler/mailto
X-Ayatana-Desktop-Shortcuts=Compose
[Compose Shortcut Group]
Name=Compose New Message
Exec=desktop-webmail mailto:%U
TargetEnvironment=Messaging Menu;Unity
X-Ubuntu-Gettext-Domain=app-install-data
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