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.CTB File Extension

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File TypeAutoCAD Color-Based Plot Style File

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CategorySettings Files


This file is saved in a binary format, which requires a specific program to read its contents.


File used by AutoCAD, a CAD program used for 2D and 3D drawing; contains color-based plot styles, or mappings of colors to layers of objects; used to attach color and display settings to design objects.

More Information

CTB files can be replaced by the newer .STB format, which abstracts layer color-based properties to object-based properties. Many companies still use CTB files instead of STB files because of the cost required to train personnel and to upgrade existing CAD designs.

NOTE: CTB files and STB files cannot both be used within the same CAD design. CTB files may be converted to STB files using AutoCAD.

Program(s) that open .CTB files
Microsoft Windows LogoWindows
Autodesk AutoCAD 2016
Updated 1/6/2010