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Sound files on popflock.com resource generally use the Vorbis or MP3 audio format, and video files use the VP9 or Theora format, both contained in either WebM or Ogg files. However, Microsoft Windows, iOS, and older macOS do not support these formats by default, and depend on software to play the files. When you use popflock.com resource in a browser this software is integrated by default.
Music files may occasionally use the MIDI format (.MID or .MIDI extension). popflock.com resource can play a MIDI file by converting it to digital audio, or depending on how the MIDI file is linked it may rely on your computer's browser and hardware to play the MIDI file.
For help making and converting video and audio into the format usable on Wikipedia, see popflock.com Resource: Creation and usage of media files.