The File Extensions Database

.CTB File Extension

  • Developer by: Autodesk
  • Category: Settings Files
  • Format: Binary

What is an .CTB file?

.CTB is AutoCAD Color-Based Plot Style File

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.

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.

Programs that open AutoCAD Color-Based Plot Style File
Autodesk AutoCAD 2018
File Type 2 Cherrytree SQLite Document
Developer by: giuspen Category: Data Files

A CTB file is a document created by Cherrytree, a note-taking application. It stores document data in SQLite format, which may include text, tables, images, objects, and document settings. CTB files protected with a password are saved as .CTX files.

Users typically save Cherrytree documents as CTB or CTX files. However, they may also save documents in XML format as .CTD files. Password-protected CTD files are saved as .CTZ files. CTD and CTZ files are useful for saving documents that are smaller in size than CTB and CTX files.

NOTE: Cherrytree is developed by giuspen, a portmanteau of Giuseppe Penone.

Programs that open Cherrytree SQLite Document
giuspen Cherrytree
giuspen Cherrytree

How to solve problems with CTB files

  • Associate the CTB file extension with the correct application. On :
    Windows: Right click on any CTB file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.CTB files". Mac: Right click (or Ctrl-click) the CTB file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .CTB is AutoCAD Color-Based Plot Style File. Because only the current version supports the latest CTB file format. Search, therefore, e.g. on the Autodesk manufacturer website after an available .CTB is AutoCAD Color-Based Plot Style File update.
  • To make sure that your CTB file is not corrupted or virus-infected, get the file again and scan it with antivirus software.