As well as PNG, BMP, PDF, ASCII art (j/k no text files hosted here), aPNG, TIFF, WEBP, JPG, JPEG-2000, JPEG XL, and probably some lesser-used formats that slip my mind at the moment.
[@Background Pony \#176E](/forums/meta/topics/search-by-file-type?post_id=5359388#post_5359388)
Thank you for the FYI. I would not have made this thread if the search help page were in sync with the full list of supported fields.