I find file-format quite useful for detecting many types of documents. However, for detecting various (often proprietary) RAW image formats, it lacks some that are industry standard such as Sony ARW, Canon CR2/CR3, Nikon NEF. Many of them are TIFF-based (and some are MP4-based).
I noticed Adobe DNG detection (which are technically TIFF) is already supported. Would there be interest in a PR to include detection for various proprietary raw image formats?