Notes about the WINDOWSLIVECONTACT file extension:
To open this file type, a required software must be installed. Without it you only see a Windows message "The following file cannot be opened
" (Windows 7) or "How do you want to open this file?
" (Windows 10) if you double-click the file. There click on "More apps"
and choose a suitable software to view such files on your PC or from email attachments.
The WINDOWSLIVECONTACT file type is primarily associated with 'Windows Live Messenger' by Microsoft Corporation.
These should be in the hidden folder C:\Documents and Settings\[user name]\Contacts and will likely be a series of files with scrambled names for the contacts.
These files will be difficult to recover (if even possible) so periodically one should export the contact list to a .CTT file backup which can then be imported into Messenger should a problem occur and you have to reload Messenger.