What's the CTT File?

Writer:   |   Refreshed: November 26, 2018

Microsoft Silver

CTT File Summary

Six known software programs (notably, Microsoft Notepad developed by Microsoft Corporation) are related to the CTT file extension. In addition, they are categorized under two distinct file types, but mainly identified as the Messenger Contact List format. These files can be categorized as Data Files.

File Extension CTT files have been identified on both desktop and mobile devices. They are fully or partially supported by Windows, Mac, and Linux. These files have a Popularity Rating of "Low", meaning they are not very commonly observed on your average hard disk.

Please see the detailed information below to learn more about CTT files and the programs that can open them. In addition, we provide simple troubleshooting information to help you open your CTT file.

Low
File Type Popularity
5811
File Rank

/ 11690

Active

Status

26

November

2018

Page Last Updated

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Kinds of CTT Files

  2 known file types use this extension

Main CTT Affiliation

.CTT
File Ext:.ctt
Class:Messenger Contact List

The file contains a list of contacts as well as groups utilized by the MSN/Live Messenger; an instant messaging program. It is stored as an XML formatted text file. It can be exported from the program and imported by another user.

Programmer: Microsoft Corporation
File Category:Data Files
Folder: HKEY_CLASSES_ROOT\.ctt

Software Programs That Open The Messenger Contact List:


Microsoft Notepad by Microsoft Corporation

Windows
Mac
Linux

Notepad++ by Don Ho

Windows
Mac
Linux

Sublime Text by Sublime HQ Pty Ltd

Windows
Mac
Linux

Microsoft Windows Live Messenger by Microsoft Corporation

Windows
Mac

Microsoft Messenger by Microsoft Corporation

Mac

Secondary CTT Associations

.CTT
File Ext:.ctt
Class:LabVIEW Control Template File

The file contains a template for .ctl control data for the graphical programming platform; LabVIEW.

Programmer: National Instruments
File Category:Data Files

Software Programs That Open LabVIEW Control Template File Files:


LabVIEW by National Instruments

Compatible with:

Windows
Mac
Linux

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CTT Requests


Browser Hierarchy

Chrome (58.80%)
Firefox (11.05%)
Internet Explorer (9.04%)
Edge (8.46%)
Safari (3.87%)


Troubleshooting Problems Opening CTT Files


Frequent CTT Opening Issues

Microsoft Notepad Not Present

When trying to open your CTT file, you get the error "Can't Open CTT File Type". If so, it typically means that you don't have Microsoft Notepad installed for %%os%%. Because your operating system doesn't know what to do with this file, you won't be able to open it by double-clicking.


Tip: When you have another program installed that you know will open your CTT, you can select it from the other programs listed (see "Show Apps").


Outdated Microsoft Notepad

Sometimes your installed version of Microsoft Notepad won't support your Messenger Contact List file. Download the latest Microsoft Notepad version from the Microsoft Corporation website to ensure you have the correct one installed. 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: Right-clicking on your CTT, then clicking "Properties" (Windows) or "Get Info" (Mac), can provide clues about your file version.


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


More Causes of Problems Opening CTTs

In the majority of cases, installing the right version of Microsoft Notepad will resolve your issue. If you are continuing to have errors with loading CTT files, other external issues might be to blame. Issues that aren't software-related:

  • Windows Registry CTT file paths that are incorrect
  • The CTT file description within the Windows Registry was removed
  • Corrupt install of Microsoft Notepad or other CTT-related program
  • CTT file corruption
  • Past or present virus infection has affected your CTT
  • Hardware associated with CTT has outdated drivers
  • Your computer does not have the adequate system resources to open the Messenger Contact List format

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