This is a RAR archive, a common format used to compress large amounts of data.
Note that this game was famous at launch for requiring a 64-bit OS and at least 6GB of RAM (though patches later lowered this). Are you having trouble extracting this specific part, or Call.of.Duty.Ghosts.MULTi6.part2.rar
You only need to right-click Part 1 and select "Extract Here" (using software like WinRAR or 7-Zip). The software will automatically pull data from Part 2, Part 3, and so on to reconstruct the full game installer or ISO file. This is a RAR archive, a common format
Instead of the traditional "Zombies" mode found in Black Ops, Ghosts featured an alien-defense mode called Extinction. The software will automatically pull data from Part
Released in 2013 by Infinity Ward, Ghosts introduced a few unique elements to the franchise:
Set in a near-future where the U.S. has been devastated by an orbital weapon attack, you play as part of the "Ghosts," an elite special ops force.