/usr/share/applications/screensavers/webcollage.desktop is in xscreensaver-screensaver-webcollage 5.15-3ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Name=WebCollage
Exec=/usr/lib/xscreensaver/webcollage -root
TryExec=/usr/lib/xscreensaver/webcollage
Comment=This makes collages out of random images pulled off of the World Wide Web. It finds these images by doing random web searches, and then extracting images from the returned pages. WARNING: THE INTERNET SOMETIMES CONTAINS PORNOGRAPHY. The Internet being what it is, absolutely anything might show up in the collage including -- quite possibly -- pornography, or even nudity. Please act accordingly. See also http://www.jwz.org/webcollage/ Written by Jamie Zawinski.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;
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