What is a ctt file and how do I open a ctt file?

Files used by the Windows Live Messenger software, an IM (Instant Messaging) application developed by Microsoft, are appended with the .ctt extension. These CTT files are generally classified as data files because the Windows Live Messenger application references data stored in these CTT files for storing and displaying details entered by users to their contact lists in this IM software. The content of these CTT files are encoded in plain text format and is also implemented with XML-based specifications for storing data. Mac users can install the Microsoft Messenger software developed for Mac environments to implement support functionalities into their systems for these CTT files. The MSN Messenger IM tool also uses these CTT files and may be installed by Microsoft Windows users. Basic text editing applications can also be used to open and view the content stored in files affixed with the .ctt extension. These IM applications provide intuitive features in its GUI (Graphical User Interface) so users won't need to manually enter data in these CTT files.

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