.ITMS File Extension
File TypeiTunes Music Store Link File
What is an ITMS file?
Music store link file used by iTunes, a program used to shop, organize, and play music; stores a link to a location within the iTunes music store; often hosted within Web pages so that the iTunes music store location is launched when the user clicks on the file in a Web browser.
iTunes music store links can also be created for Web browsers using the "itms://" protocol.