/usr/share/app-install/desktop/plasma-active:kde4__active-filebrowser.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.
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X-AppInstall-Package=plasma-active
X-AppInstall-Popcon=46
X-AppInstall-Section=universe
Name=Files
GenericName=File browser
Comment=A simple file browser/manager
X-KDE-Solid-Predicate=[ StorageVolume.ignored == false AND StorageVolume.usage == 'FileSystem' ]
Exec=active-filebrowser -graphicssystem raster %u
Terminal=false
Icon=system-file-manager
Type=Application
Categories=Qt;KDE;System;FileManager;ActiveCore;
MimeType=inode/directory;
InitialPreference=9
X-Ubuntu-Gettext-Domain=app-install-data
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