CTT File Type

- The quick facts

What are CTT files and how to open them

Are you having problems opening a CTT file or just wondering what they contain? We explain what these files are used for and show you software that we know can open or otherwise handle your 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 4 different CTT openers which you will find listed below.

Last updated: June 18, 2022

Suggest another file format using extension CTT

While we know of one file format using the .CTT file extension, there may be more. It is widespread that different programs use files with the same file extension for very different types of data. Please let us know if you are aware of a different kind of .CTT file.

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
ROBOLABROBOLABUser submitted
NI LabVIEWNI LabVIEWUser submitted
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