This file is indexed.

/usr/share/applications/screensavers/m6502.desktop is in xscreensaver-data-extra 5.15-2ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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[Desktop Entry]
Name=m6502
Exec=/usr/lib/xscreensaver/m6502 -root
TryExec=/usr/lib/xscreensaver/m6502
Comment=This emulates a 6502 microprocessor. The family of 6502 chips were used throughout the 70's and 80's in machines such as the Atari 2600, Commodore PET, VIC20 and C64, Apple ][, and the NES. Some example programs are included, and it can also read in an assembly file as input. Original JavaScript Version by Stian Soreng: http://www.6502asm.com/. Ported to XScreenSaver by Jeremy English. Written by Stian Soreng and Jeremy English.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;