A NOMEDIA file is a file stored on an Android mobile device, or on an external storage card connected to an Android device. It marks its enclosing folder as having no multimedia data so that the folder will not be scanned and indexed by multimedia players. NOMEDIA files have no filename prefix and are simply named .nomedia.
More .NOMEDIA File Extension Information
The use of NOMEDIA files helps boost performance by excluding folders that do not need to be scanned. For example, a folder that has thousands of songs or images can be excluded. NOMEDIA files can also be used to hide ads featured in free apps when placed in the same directory of the ad. Many Android audio and video players as well as image browsers (Gallery, MP3 Player, Video Player, etc.) recognize NOMEDIA files.
NOTE: NOMEDIA files can be managed by utilities such as StudioKUMA .nomedia Manager or Nomedia.
How to open .NOMEDIA files?
.NOMEDIA can be using by 1 Flatform (Android). And can be open by bellow programs list: