Document

Desktop Publishing

 * Impression
 * PageMaker (originally from Aldus, later Adobe)
 * PageMagic
 * pub - Microsoft Publisher
 * The Print Shop (Broderbund)
 * dtp - Publish It!

Document storage/exchange formats (non-program-specific)

 * CSV (Comma Separated Values)
 * PDF (Portable Document Format)
 * RTF (Rich Text Format)
 * RTFD (Rich Text Format Directory)
 * TXT (Un-structured text document)

eBook / ePublication formats

 * AZW
 * EPUB
 * MOBI

Markup

 * HTML (HyperText Markup Language)
 * Markdown
 * Scribe
 * SGML (Standard Generalised Markup Format)
 * TEI (Text Encoding Initiative; Specialised dialect of SGML)
 * TEX (TeX)
 * XHTML (Extensible HTML)
 * XML

Multi-function office suites

 * UOF

Presentation

 * OpenDocument presentation (ODP)
 * PPS (PowerPoint slide show)
 * PPSM (PowerPoint macro-enabled slide show)
 * PPSX (PowerPoint slide show, XML format)
 * POT (PowerPoint template)
 * POTM (PowerPoint macro-enabled template)
 * POTX (PowerPoint template, XML format)
 * PPT (PowerPoint presentation)
 * PPTM (PowerPoint macro-enabled presentation)
 * PPTX (PowerPoint presentation, XML format)
 * SXI (StarOffice)

Spreadsheet

 * Lotus 1-2-3
 * Lotus Symphony
 * Open Document Spreadsheet
 * ODS files created by Microsoft Office 2007 SP2
 * SDC (StarOffice spreadsheet)
 * XLS (Excel spreadsheet format)
 * XLSB (Excel binary workbook)
 * XLSM (Excel macro-enabled spreadsheet format)
 * XLSX (Excel spreadsheet format, XML version)
 * XLT (Excel template)
 * XLTM (Excel macro-enabled template)
 * XLTX (Excel template, XML version)
 * SuperCalc 3
 * VisiCalc

Word Processor

 * ABW (Abiword word processor)
 * CHI (ChiWriter word processor)
 * EasiWriter / TechWriter (Word processor file format)
 * IBM Displaywriter (dedicated word processing machine)
 * MCW
 * MultiMate Professional Word Processor
 * Kingsoft Office (.wps)
 * Locoscript
 * Microsoft Word
 * DOC (Word document)
 * DOCM (Word macro-enabled document)
 * DOCX (Word document, XML format)
 * DOT (Word template)
 * DOTM (Word macro-enabled template)
 * DOTX (Word template, XML format)
 * Microsoft Works (.wps)
 * Open Document Text (.odt)
 * PC-Write
 * Samna Word
 * ScreenWriter II (for Apple II; formerly SuperScribe II)
 * Star Office Writer
 * SDW
 * SXW (Also used by OpenOffice.org)
 * TechWriter (Scientific word processor file format)
 * WordPerfect
 * WordStar
 * WordStar 2000

Other

 * 602
 * ACL
 * AFP
 * ANS
 * ASC
 * AWW
 * CCF
 * CWK
 * DJVU
 * DOX (Mutimate document, and others)
 * EGT
 * FDX
 * FTM
 * FTX
 * GM6 (Game Maker 6 source)
 * GMK (Game Maker 7-8 source)
 * HWP
 * HWPML
 * LWP
 * MBP
 * NB
 * NBP
 * ODM
 * OMM
 * ONE (Microsoft OneNote 2010 / 2007 Section)
 * ONEPKG (Microsoft OneNote Package)
 * OTT
 * PAGES
 * PAP
 * PAT (Multimate document, and many others)
 * PDAX
 * QUOX
 * RPT
 * scriv (Scrivener document format)
 * STW
 * UOML
 * VIA
 * WPS
 * WPT
 * WRD
 * WRF
 * WRI
 * XPS