Google Play Music ID File
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What is a _PLAYMUSICID file?
A _PLAYMUSICID file is a data file used to identify the account of a Google Play Music user. It contains a unique string of identifying characters and is stored on an external storage card connected to an Android device.
_PLAYMUSICID files have no filename prefix and are simply named ._playmusicid.
_PLAYMUSICID files are not meant to be opened. Instead, they are used to verify the Google Play Music user. You can open a _PLAYMUSICID file and view the contents with a text editor. The files are located in the SD card in the following directory: