The document is a picture file that requires QuickTime and an H.264 video decompressor to be viewed properly. It likely contains a compressed video or image, but without the required software and codecs installed, the file contents cannot be rendered or seen. In short, the document is a media file that needs additional software to display its visual contents.

13. QuickTime™ and a
H.264 decompressor
are needed to see this picture.