A file that contains or defines other files. Many operating systems use metafiles to contain directory information about other files on a given storage device.
A file containing information that describes or specifies another file. Some streaming media formats use metafiles to invoke the client media player and/or to specify the location of a streaming file on a media server.
In a Windows Media Technologies system, a text file that contains information, for media content. Windows Media Services use three kinds of metafiles: .asd file metafiles, .asx file metafiles, and .nsc file metafiles.