/usr/lib/x86_64-linux-gnu/libretro/bsnes_mercury_balanced.libretro is in libretro-bsnes-mercury-balanced 094+git20160126-1ubuntu2.
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 | [Libretro]
Type=Emulator
Version=1.0
Name=bsnes-mercury Balanced
Module=bsnes_mercury_balanced_libretro.so
LibretroVersion=1
Authors=byuu;
License=GPL-3.0;
[Platform:SuperNintendoEntertainmentSystem]
MimeType=application/vnd.nintendo.snes.rom;
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