Why do older files tend to have file extensions in all caps?

I have a collection of files from the late ´90s and early ´00s. Many of them are .JPG, .MP3, .WAV, instead of .jpg, .mp3, and .wav. Why was that the norm at the time? I usually just change the extension myself.

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daggermoonOP
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1 month ago
Yes, but the bulk of it is CD, DVD, and Blu-ray rips.

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