/usr/share/avant-window-navigator/applets/file-browser-launcher.desktop is in awn-applet-file-browser-launcher 0.4.1~bzr1507-0ubuntu7.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Type=Application
X-AWN-Type=Applet
X-AWN-AppletType=Python
Name=File Browser Launcher
Comment=A launcher for your file manager
Exec=awn-applet -p %k
X-AWN-AppletExec=file-browser-launcher/file-browser-launcher.py
Icon=folder
X-Ubuntu-Gettext-Domain=awn-extras-applets
X-AWN-AppletCategory=Utility,FileTools
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