Valve Hammer Object Layout File
3.6 | 12 Votes
What is an OL file?
File created by Valve Hammer Editor, a mapping tool for the Goldsource engine that runs games like Half-Life and Counter-Strike; contains prefabs, or objects, and their .WAD texture files; referenced by Hammer to map out objects and textures.
NOTE: Hammer Editor is included in the Source game engine SDK.