What is a nomedia file and how do I open a nomedia file?

NOMEDIA files are stored on Android mobile devices, or on external storage cards connected to an Android device. This folder should not be scanned and indexed by multimedia players. It has no filename prefix and is simply named NOMEDIA. The use of NOMEDIA files helps boost device performance by excluding folders that do not need to be scanned. NOMEDIA  allows media files to be hidden without installing any other application.

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