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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. [24]
A file signature is data used to identify or verify the content of a file. Such signatures are also known as magic numbers or magic bytes. Many file formats are not intended to be read as text. If such a file is accidentally viewed as a text file, its contents will be unintelligible.
Original file (1,275 × 1,650 pixels, file size: 271 KB, MIME type: application/pdf, 3 pages) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
DOT – Microsoft Word document template; DOTX – Office Open XML text document template; DWD – DavkaWriter Heb/Eng word processor file; EGT – EGT Universal Document; EPUB – EPUB open standard for e-books; EVTX – Windows XML EventLog files are system log files used by the Windows operating system [9] EZW – Reagency Systems easyOFFER ...
Sample folder icon (from KDE). The name folder, presenting an analogy to the file folder used in offices, and used in a hierarchical file system design for the Electronic Recording Machine, Accounting (ERMA) Mark 1 published in 1958 [5] as well as by Xerox Star, [6] is used in almost all modern operating systems' desktop environments
PDF — Open standard for document exchange. ISO standards include PDF/X (eXchange), PDF/A (Archive), PDF/E (Engineering), ISO 32000 (PDF), PDF/UA (Accessibility) and PDF/VT (Variable data and transactional printing). PDF is readable on almost every platform with free or open source readers. Open source PDF creators are also available ...
The Portable Document Format (PDF) is a file format used to present documents in a manner independent of application software, hardware, and operating systems. Each PDF file encapsulates a complete description of the presentation of the document, including the text, fonts, graphics, and other information needed to display it.
A full table of contents could be quite large. There are two categories of modules: Regional module: 1 (different for each region; i.e., country) Common modules: 2–5 (common to all the regions) The CTD defines the content only of the common modules. The contents of the Regional Module 1 are defined by each of the ICH regions (USA, Europe and ...