.M2S File Extension
File TypeMaxthon 2 Browser Skin File
What is an M2S file?
Theme or skin for the Maxthon 2 Web browser; used to customize the look and feel of the Maxthon browser interface; includes the default settings for the skin and references to images used by the skin.
M2S files support .PNG images, which allows buttons and icons referenced by the skin to use different levels of transparency.