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A PDF file is organized using ASCII characters, except for certain elements that may have binary content. The file starts with a header containing a magic number (as a readable string) and the version of the format, for example %PDF-1.7. The format is a subset of a COS ("Carousel" Object Structure) format. [23]
VirtualBox Virtual Hard Disk file format 63 6F 6E 65 63 74 69 78: conectix: 0 vhd Windows Virtual PC Virtual Hard Disk file format [85] 76 68 64 78 66 69 6C 65: vhdxfile: 0 vhdx Windows Virtual PC Windows 8 Virtual Hard Disk file format 49 73 5A 21: IsZ! 0 isz Compressed ISO image: 44 41 41: DAA: 0 daa Direct Access Archive PowerISO 4C 66 4C 65 ...
CAG (file format) – Linear Reference System; FES (file format) – 3D Topicscape file, produced when a fileless occurrence in 3D Topicscape is exported to Windows. Used to permit round-trip (export Topicscape, change files and folders as desired, re-import them to 3D Topicscape) MGMF – MindGenius Mind Mapping Software file format
PDF files start with "%PDF" (hex 25 50 44 46). DOS MZ executable files and the EXE stub of the Microsoft Windows PE (Portable Executable) files start with the characters "MZ" (4D 5A), the initials of the designer of the file format, Mark Zbikowski. The definition allows the uncommon "ZM" (5A 4D) as well for dosZMXP, a non-PE EXE. [12]
As well as identifying the file format, file headers may contain metadata about the file and its contents. For example, most image files store information about image format, size, resolution and color space , and optionally authoring information such as who made the image, when and where it was made, what camera model and photographic settings ...
Short title: example derived form Ghostscript examples: Image title: derivative of Ghostscript examples "text_graphic_image.pdf", "alphabet.ps" and "waterfal.ps"
For example, a GIF file can contain multiple images, and headers are used to identify and describe each block of image data. The leading bytes of the header would contain text like GIF87a or GIF89a that can identify the binary as a GIF file. If a binary file does not contain any headers, it may be called a flat binary file.
The mime.types file dates to Netscape, where it used a different format; [20] it used key–value pairs and a comma-separated list of extensions, together with a standard header consisting of a specific comment that identifies the file as a mime.types file, as follows: