Doc (an abbreviation of document) is a file extension for word processing documents; it is associated mainly with Microsoft and their Microsoft Word application. Historically, it was used for documentation in plain-text format, particularly of programs or computer hardware, on a wide range of operating systems. Almost everyone would have used the doc file format, whenever you write a letter, do some work or generally write on your PC you will use the doc file format. It was in the 1990s that Microsoft chose the doc extension for their proprietary Microsoft Word processing formats. As PC technology has grown the original uses for the extension have become less important and have largely disappeared from the PC world.
Early versions of the doc file format contained mostly formatted text, however development of the format has allowed doc files to contain a wide variety of embedded objects such as charts and tables from other applications as well as media such as videos, images, sounds and diagrams. doc files can also contain mail merge information, which allows a word-processed template to be used in conjunction with a spreadsheet or database.
AbiWord Apple Pages AppleWorks KWord Microsoft Word StarOffice
Files with a .pages09 file extension are word processing documents which are generated by Apple's "Pages" application in versions 4.0, 4.1, 4.2 and 4.3 (these versions of the software were released between 2009-2012).
This is distinct from the pages file produced by more modern versions of iWork.
Pages forms part of Apple's iWork office suite, a set of applications which run on the Mac OS X and iOS operating systems, and also includes Numbers (for spreadsheets) and Keynote (for presentations).
Pages is a hybrid application, first released by Apple in February 2005, that allows users to perform both word processing and page layout tasks.
Official file format specifications for iWork '09 pages files are not published by Apple but there have been attempts by somedevelopers to reverse engineer them. At the top level iWork '09 pages files represent a zip file containing:
An index.xml file
A buildVersionHistory file
A "QuickLook" directory with a "Thumbnail.jpg" of the document. The directory may also contain a PDF file named "Preview.pdf" if the user chose to save the original document with additional preview information in Pages.
The index.xml is the core component of the file, containing the document content and all of the metadata for formatting it. This XML is not standards-based as Pages does not support the OpenDocument file format used by Microsoft.
Files created by Pages in iWork '09 are not backwards compatibile with earlier versions of iWork. Pages files cannot be opened by programs other than iWork.