/usr/share/applications/mupen64plus.desktop is in mupen64plus-ui-console 2.5-3.
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 12 | [Desktop Entry]
Version=1.0
Type=Application
Name=Mupen64Plus
GenericName=N64 Emulator
Comment=Nintendo 64 emulator and plugins for Linux, Mac OSX, FreeBSD, and Windows
Exec=mupen64plus %f
Icon=mupen64plus
MimeType=application/x-n64-rom;
Categories=Game;Emulator;
Keywords=Emulator;Nintendo64;Mupen64plus;
NoDisplay=true
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