.PLSK File Extension
File TypeMessenger Plus! Live Skin Pack
File format categories include Binary, Text, XML, and Zip. The format of this file type has not been determined.
Skin that can be applied to the interface of Windows Live Messenger (WLM), a popular instant messaging program for Windows; requires the Messenger Plus! Live add-on, which provides extra functionality for WLM.
NOTE: Windows Live Messenger was discontinued in 2013 and has moved to Skype.