@JGSchaeffer @MrGoat one of the 1sr things I do when I get a new computer is fix File Explorer so it shows the extensions for all filenames. I'm old school like that. Extensions show you what kind of file you are looking at (ex: txt, doc, csv, mp3, ...). Window stopped displaying extensions by default as far back as Windows95, to more closely resemble Macintosh, but software still needs them so it knows what format a file is in.
WEBP is the most notorious of them all.