/usr/share/applications/mednafen.desktop is in mednafen 0.9.36.4-1.
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 | [Desktop Entry]
Type=Application
Version=1.0
Name=Mednafen
GenericName=Emulator
Comment=Multi-system video game emulator
# mednafen doesn't display a file chooser, no point displaying it in
# the menus
NoDisplay=true
Exec=/usr/games/mednafen %f
MimeType=application/x-gameboy-rom;application/x-gba-rom;application/x-genesis-rom;application/x-nes-rom;application/x-sms-rom;application/x-snes-rom
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