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CTT File

What are CTT files and how to open them

Are you having problems opening a CTT file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your CTT files.

What is a CTT file?

A .CTT file is a MSN Messenger Saved Contact List file.

Files that contain the .ctt file extension are used by the Microsoft Windows Live Messenger instant messaging software application. Windows Messenger is a free instant message application that is distributed by Microsoft.

The CTT files used by the Windows Messenger IM application store a user's contact information in the XML file format. CTT files contain information such as the names and email addresses of a user's list of contacts. Another user can import these files to share contact lists and contact information. CTT files can also be helpful if a user loses their contact information, providing a backup resource for their contact files.

How to open CTT files

Important: Different programs may use files with the CTT file extension for different purposes, so unless you are sure which format your CTT file is, you may need to try a few different programs.

While we have not verified the apps ourselves yet, our users have suggested three different CTT openers which you will find listed below.

Last updated: February 24, 2023

Various apps that use files with this extension

These apps are known to open certain types of CTT files. Remember, different programs may use CTT files for different purposes, so you may need to try out a few of them to be able to open your specific file.

National Instruments LabVIEWNational Instruments LabVIEWUser submitted
NI LabVIEWNI LabVIEWUser submitted

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File.org helps thousands of users every day, and we would love to hear from you if you have additional information about CTT file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.