Sorts of CTB Files

Principal CTB Type

.CTB

Formatting:	.ctb
Category:	AutoCAD Color-Based Plot Style File

CTB file is used by AutoCAD, it contains color-based plot styles, or mappings of colors to layers of objects. It used to attach color and display settings to design objects.

Developer:	Autodesk, Inc.
Kind:	Settings Files
Key:	HKEY_CLASSES_ROOT\.ctb

Software Programs That Open The AutoCAD Color-Based Plot Style File:

Autodesk AutoCAD by Autodesk, Inc.

Windows

	Mac
	iOS

Android

Alternative CTB Types

.CTB

Formatting:	.ctb
Category:	NoteTab Clipbar Data

CTB file stores clipbar data associated with NoteTab, a HTML and text editing program.

Developer:	Fookes Software
Kind:	Data Files

Software Programs That Open NoteTab Clipbar Data Files:

NoteTab by Fookes Software

Compatible with:

Windows

.CTB

Formatting:	.ctb
Category:	Custody Toolbox Data File

CTB file contains data from Custody Toolbox, an application used to help users to get organized in custody situation.

Developer:	Dextronet
Kind:	Data Files

Software Programs That Open Custody Toolbox Data File Files:

Custody Toolbox by Dextronet

Compatible with:

Windows

Optional Offer for FileViewPro by Solvusoft | EULA | Privacy Policy | Terms | Uninstall

Sources of CTB Problems

Troubles Opening CTB Files

Autodesk AutoCAD Removed

Double-clicking your CTB file prompts the message "%%os%% Can't Open CTB File". Generally, this is experienced in %%os%% because Autodesk AutoCAD isn't installed on your PC. This will prevent you from double-clicking to open the CTB file because the OS doesn’t know how to handle it.

Tip: Another CTB-related program can be selected to open the file by clicking "Show Apps" and finding the application.

Obsolete Version of Autodesk AutoCAD

Sometimes your installed version of Autodesk AutoCAD won't support your AutoCAD Color-Based Plot Style File file. Installing the latest version of Autodesk AutoCAD from Autodesk, Inc. is recommended. This problem is most common when you have an older version of the software application, and your file was created by a newer version that it cannot recognize.

Tip: If you right-click on your CTB file, then select "Properties" (Windows) or "Get Info" (Mac), you can obtain hints about what version you need.

Summary: In either case, the majority of problems opening CTB files are related to not having the correct software application installed on your computer.

Additional CTB Opening Issues

Errors opening AutoCAD Color-Based Plot Style File files can still occur even with the latest Autodesk AutoCAD software installed on your computer. There can be other issues - unrelated to software - preventing you from opening CTB files. These other problems include (listed in order from most to least common):

• Invalid CTB file references in the Windows Registry (the "phonebook" of the Windows Operating System)
• Unintentional removal of the description of the CTB file inside the Windows Registry
• Defective install of a CTB program, such as Autodesk AutoCAD
• File corruption affecting your CTB file
• Past or present virus infection has affected your CTB
• Device drivers of the hardware associated with your CTB file are corrupt or out-of-date
• Your PC doesn’t have enough available resources to open the AutoCAD Color-Based Plot Style File file