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an analog audio file stores the sound waves as continuous wave-forms
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But that's only a computer file if it's a computer file on say cassette, in which case the analog data represents digital data.
All computer files are digital information, even if stored in analogue fashion like old cassette tapes on home computers.
If it's not computer readable as digital content, then it's not a computer file even if it's digital in nature,
An ancient EEG or weather station recording may not be a computer file.
Analogue dialup modems transfer digital computer files using analogue signals.
All computer files are digital even if the recording on medium is analogue.