.ITEMDATA-MS File Extension
Windows 8 Start Screen Item Data File
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What is an ITEMDATA-MS file?
System file used by the Windows 8 operating system; contains user settings that define the layout of items on the Windows 8 Start screen; arranges tiles for items such as news, weather, Windows programs, and user applications.
Windows 8 stores a file called appsFolder.itemdata-ms in the [user]\AppData\Roaming\Microsoft\Windows\ directory. It also stores a backup of the items data in a file named appsFolder.itemdata-ms.bak.