I would love it if there was a way to detect well-known media file types, like JPEG, PNG and MOV. My goal is to add/restore the correct file extension. Ideally, there would be a "Detected Type" column that would show content in a different color if the detected type was different from the extension type.
The reason for this in my case is that Apple's iPhone namespace extension (or whatever it is, it's not a real filesystem from what I can tell) for Windows can sometimes mess with file names and types, and files get copied from the phone to the PC as JPG instead of PNG, or vice versa. I noticed this again today, and looking back I can see this in files from years ago. I have a hack to fix this, but it is not perfect: if I rename all extensions to JPG, Bulk Rename Utility will show some EXIF metadata for "real" JPEGs, and not for PNGs, so I can sort, select and rename. However, this mechanism is not perfect, as there are also other file types, and JPEGs also exist without EXIF data (e.g. from Messenger apps).