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Windows Live Messenger contact list file
File type: Settings, options, themes or skins file, Internet related file
Files with ctt suffix can be typically found as old contact files for Window Live Messenger instant messaging client.
Found 2 different file type records with the same ctt filename suffix.
File type category:
Settings, options, themes or skins file
Internet related file
Date updated: November 7, 2024
Record marked as obsolete and not updated for a long time.
File extension ctt is most likely best known for its use in Microsoft Windows Live Messenger up to version 4.6 and older for its contacts file format.
CTT is a proprietary file format used by Microsoft software. it contains save list of contacts and groups used by the MSN/Live Messenger instant messaging program in XML format. It is used for exporting and importing of whole contact groups.
A typical *.ctt file looks something like this:
<?xml version="1.0"?>
<messenger>
<service name=".NET Messenger Service">
<contactlist>
<contact>first_contact@some_domain.com</contact>
<contact>second_contact@some_domain.com</contact>
<contact>third_contact@some_domain.com</contact>
...
<contact>last_contact@some_domain.com</contact>
</contactlist>
</service>
</messenger>
Microsoft abandoned the use of CTT format in newer versions. Latest versions of MSN grab contacts directly from social networks / e-mail clients or work with CSV format instead. However, it may be still possible to import .ctt file to latest MSN.
Considering the program was replaced by Skype, this file type is more than obsolete now.
You can import .ctt files by selecting File → Import Contact from a Saved file in the application window.
You can view and edit a .ctt in any text editor.
Because .ctt is a XML based format, there is a way to convert it to CSV format used by the later variants of MSN.
Software apps that import ctt files:
Microsoft Windows
Apple macOS / Mac OS X
Software apps that export ctt files:
Microsoft Windows
Apple macOS / Mac OS X
Software apps that manage or store settings in ctt files:
Microsoft Windows
Apple macOS / Mac OS X
File type category:
Various data file
Date updated: February 13, 2019
The ctt file extension is associated with the LabVIEW, a graphical programming platform that helps engineers scale from design to test and from small to large systems.
The ctt file stores template for .ctl control data.
Use LabVIEW to work with *.ctt files.
Probably can be exported to other formats.
Software applications that can open ctt files:
Microsoft Windows
Software applications that can edit ctt files:
Microsoft Windows
Software capable of saving ctt files:
Microsoft Windows
Software apps that create ctt files:
Microsoft Windows
Software applications that handle other tasks involving ctt files:
Microsoft Windows