CTT File - opening and understanding

Did your computer fail to open a CTT file? We explain what they are used for and recommend software that we know can open or otherwise handle your .CTT files.

What is a CTT 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 the Microsoft Corporation.

The CTT files that are 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. These files can be imported by another use to share contact lists and contact information. CTT files can also be helpful if a user loses his or her contact information, providing a backup resource of the user's contact files.

How to open CTT files

You will need a program compatible with the specific file you are trying to open, as different programs may use files with file extension CTT for different purposes.

While we have not verified the apps ourselves yet, our users have suggested 4 different CTT openers which you will find listed below.

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 viewers for this file format

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
LabVIEWLabVIEWUser submitted
We have not verified any software that we know for certain will work with CTT-files on Mac. If you know one, please use the 'Suggest a program' link below and tell us about it!
We have not verified any web services that we know for certain will work with CTT-files. If you know one, please use the 'Suggest a program' link below and tell us about it!