/usr/share/app-install/desktop/kmail:kmail_view.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 | [Desktop Entry]
X-AppInstall-Package=kmail
X-AppInstall-Popcon=4125
X-AppInstall-Section=universe
Name=KMail view
Type=Application
Exec=kmail --view %u
Icon=kmail
NoDisplay=true
MimeType=message/rfc822;application/mbox;application/x-mimearchive;
X-KDE-StartupNotify=true
X-DBUS-StartupType=Unique
X-DBUS-ServiceName=org.kde.kmail
X-Ubuntu-Gettext-Domain=app-install-data
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