[QuantumNomad_]

Never thought about that. Always wrote it all uppercase because that’s what camera maker Canon consistently does from what I’ve seen.

If I search for Canon raw on Google the Canon owned websites that I see writes it all uppercase; RAW.

One of their pages that I find even makes note of that:

> The letters RAW do not stand for anything – it's just a convention that RAW is usually written in capital letters – and the names of RAW files from Canon cameras do not end in .RAW.

https://www.canon-europe.com/pro/infobank/image-file-types/

[jcelerier]

I'd expect a cause is that most camera makers are Japanese, and it's not uncommon in Japan to uppercase words written in Latin alphabet for aesthetic reasons

[strogonoff]

Very plausible, I haven’t considered it.

Perhaps the combination of that and the old .raw filename extensions on old filesystem implementations where everything appears uppercase (since camera firmware is slower to catch up, this persisted for years even though contemporary OS already had no such limitation) made it stick.

[strogonoff]

I can only recommend to consult more trustworthy sources.