The CTB file format is used by AutoCAD.
AutoCAD is a professional 2D and 3D design and drafting program that is used to create models of parts and other schematics for use in the manufacturing industry.
.ctb File
Extension
Developer:
Autodesk
File category:
What are ctb files & how to open them - Autocad Colour-dependent Plot Style Table Fil
File category:
Developer:
Autodesk