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Windows Live Messenger (previously known as MSN Messenger), is a free instant messaging client, developed by Microsoft for computers running the Microsoft Windows operating system.

The .ctt file type is used by Windows Live Messenger to store a backup of a user's contact list, that can easily be imported back in to WLM at a later stage. The .ctt file is really just a text file in the XML format, and can be opened using notepad if required.

To backup your contact list/address book:

- Click the down arrow at the top of the messenger window (To the right of the "Windows Live Messenger" text).
- Select "Contacts" menu
- Select "Save Instant Messaging Contacts"
- Specify the save location (defaults to your 'My Documents' folder), and click save.

Your contacts list will now be saved in the .ctt file format.

To restore your contact list/address book:

- Click the down arrow at the top of the messenger window (To the right of the "Windows Live Messenger" text).
- Select "Contacts" menu
- Select "Import Instant Messaging Contacts"
- Locate the .ctt contacts file and click open.

Your contacts list should now be restored.