What is a MCT File Type?
You can modify any MCT file to improve your Live Messenger experience. To change, say your Live Messenger scene:
If installed, MCT files will most likely be located in C:\ Program Files\ Windows Live\ Messenger\.
MCT files are similar to CAB files, use a program like WinZip or 7-Zip to open them.
Windows Live Messenger was dropped in 2013 and moved to Skype.
What is a Default MCT File Name?
Background.mct - Contains .JPG or .PNG files that make up the back-plan of Live Messenger.
Winks.mct - An animated eye for Live Messenger.
Includes JPG and PNG files that create a scene for Live Messenger.