.QC File Extension

Script used for compiling .SMD (Studiomdl Data) ASCII-based game models into Half-Life .MDL model files; contains commands for specifying the model name, the SMD model file, the locations of materials, and other properties; compiles to an MDL file using Studiomdl, a Valve command-line utility.

The "QC" acronym stands for "QuakeC," which is the Quake scripting language used as the basis for Valve QC scripts.

NOTE: QC files are actually used by Valve's Source game engine, so they are not restricted to Half-Life models.

File written in the QuakeC programming language, which was originally used for the first-person shooter game Quake; contains syntax similar to the C programming language; used for writing game artificial intelligence and other components.

QC files can be compiled using qcc, the QuakeC compiler, which was provided to the public sometime after Quake was released. Other compilers were subsequently built that enhanced QuakeC's capabilities to include other language constructs.