What is a .OL file?
The file extension .OL stands for Valve Hammer Object Layout File. This type of file is specifically created by a program called Valve Hammer Editor. The Valve Hammer Editor is a special tool used for designing maps for video games that run on the Goldsource engine. Some popular games that use this engine include Half-Life and Counter-Strike.
An .OL file contains what are known as prefabs. Prefabs are essentially pre-made objects that can be placed within a game map. Along with these objects, the .OL file also includes .WAD texture files. These texture files are important because they define what the surfaces of the objects will look like, such as their color and pattern.
When someone is using the Valve Hammer Editor to create or modify a game map, the program uses the .OL file to understand where objects should be placed and how they should appear. This makes it easier for map designers to build complex environments without having to create every single object from scratch.
If you have an .OL file that you want to open or edit, you will need to use the Valve Hammer Editor. This editor is part of the Source game engine Software Development Kit (SDK). Once you have access to the Valve Hammer Editor, you can open the .OL file to view or modify the prefabs and textures contained within it, allowing you to customize game maps for Goldsource engine games.
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