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Yeah, doing that does absolutely nothing. Your image viewer still reads it as the webp it is, and it knows to do so seamlessly because it's reading the file header (the first few bytes of the file) instead of the file extension.
For an analogy, you're basically just putting a wig on it and pretending it's your girlfriend from the next school over when everyone in the room knows it's your skeezy neighbor and is just humoring you.
fair but "it" here is pretty vague. my guess is that, in your case, whatever part of "it" that processes the image handles webp files just fine but for some reason the devs made "it" reject file extensions that don't match ".jpeg", ".png", ".whatever_else" for some reason before the file gets handled further.
It would be helpful for the discussion if you would tell us what the mystery program is, that is handling images in this strange way and what operating system you are on.