This filename likely refers to a specific version of , a hardcore tactical first-person shooter. Version 1.12 was a major milestone for the game, known as Operation: Glasshouse .

A modern, high-capacity bullpup shotgun that allows players to clear rooms with sustained fire without frequent reloading.

Here is a write-up detailing what this specific version brought to the game and its place in the tactical shooter landscape. Insurgency: Sandstorm — Operation: Glasshouse (v1.12)