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MP4A, the file format used strictly for audio tracks released in 1990 and updated in 2004. It is often used in combination with the MP3, WAV and WMA formats and can be opened by a large variety of media players such as QuickTime and RealPlayer. Mime type: video/mp4v-es, audio/mp4 Learn more about mp4a
An OFR file extension is an OptimFROG encoded audio file that is used by the similarly named OptimFROG by Florin Ghido. An OFR file is a losseless compressed audio format. Mime-type: application/octet-stream Learn more about ofr