User:Matthewrb/sandbox/List of Microsoft Office filename extensions

The following is a list of filename extensions used by programs included in Microsoft 365, formerly known as the Microsoft Office suite.

The Office Open XML (OOXML) format was introduced with Microsoft Office 2007 and became the default format of Microsoft Word, PowerPoint, and Excel ever since.

<>Legacy filename extensions denote binary Microsoft Word formatting that became outdated with the release of Microsoft Office 2007. Although the latest version of Microsoft Word can still open them, they are no longer developed.

Word

Microsoft Word is a word processing program developed by Microsoft. It was first released on October 25, 1983, under the name Multi-Tool Word for Xenix systems. Subsequent versions were later written for several other platforms including: IBM PCs running DOS (1983), Apple Macintosh running the Classic Mac OS (1985), AT&T UNIX PC (1985), Atari ST (1988), OS/2 (1989), Microsoft Windows (1989), SCO Unix (1990), Handheld PC (1996), Pocket PC (2000), macOS (2001), Web browsers (2010), iOS (2014) and Android (2015).

Microsoft Word has been the de facto standard word processing software since the 1990s when it eclipsed WordPerfect. Commercial versions of Word are licensed as a standalone product or as a component of Microsoft Office, which can be purchased with a perpetual license, or as part of the Microsoft 365 suite as a subscription. (Full article...)

OOXML Extensions

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File Extension	Icon	Description	Notes
.docx		Word Document	The default format
.docm	File:.docm icon.svg	Word macro-enabled document	Same as docx, but may contain macros and scripts
.dotx		Word template
.dotm	File:.dotm icon.svg	Word macro-enabled template	Same as dotx, but may contain macros and scripts

Legacy Formats

.doc – Legacy Word document; Microsoft Office refers to them as "Microsoft Word 97–2003 Document"
.dot – Legacy Word templates; officially designated "Microsoft Word 97–2003 Template"
.wbk – Legacy Word document backup; referred as "Microsoft Word Backup Document"

Other Formats

.docb – Word binary document introduced in Microsoft Office 2007
.pdf – PDF documents
.wll – Word add-in
.wwl – Word add-in

Excel

Legacy: Legacy filename extensions denote binary Microsoft Excel formats that became outdated with the release of Microsoft Office 2007. Although the latest version of Microsoft Excel can still open them, they are no longer developed. Legacy filename extensions include:

.xls – Legacy Excel worksheets; officially designated "Microsoft Excel 97–2003 Worksheet" or "Microsoft Excel 5.0/95 Workbook"
.xlt – Legacy Excel templates; officially designated "Microsoft Excel 97–2003 Template"
.xlm – Legacy Excel macro

OOXML: Office Open XML (OOXML) format was introduced with Microsoft Office 2007 and became the default format of Microsoft Excel ever since. Excel-related file extensions of this format include:

.xlsx – Excel workbook
.xlsm – Excel macro-enabled workbook; same as xlsx but may contain macros and scripts
.xltx – Excel template
.xltm – Excel macro-enabled template; same as xltx but may contain macros and scripts

Other formats: Microsoft Excel uses dedicated file formats that are not part of OOXML, and use the following extensions:

.xlsb – Excel binary worksheet (BIFF12)
.xla – Excel add-in that can contain macros
.xlam – Excel macro-enabled add-in
.xll – Excel XLL add-in; a form of DLL-based add-in^[1]
.xlw – Excel work space; previously known as "workbook"
.xll_ – Excel 4 for Mac add-in
.xla_ - Excel 4 for Mac add-in
.xla5 – Excel 5 for Mac add-in
.xla8 – Excel 98 for Mac add-in

PowerPoint

Legacy

.ppt – Legacy PowerPoint presentation
.pot – Legacy PowerPoint template
.pps – Legacy PowerPoint slideshow
.ppa – Legacy PowerPoint add-in

OOXML

.pptx – PowerPoint presentation
.pptm – PowerPoint macro-enabled presentation
.potx – PowerPoint template
.potm – PowerPoint macro-enabled template
.ppam – PowerPoint add-in
.ppsx – PowerPoint slideshow
.ppsm – PowerPoint macro-enabled slideshow
.sldx – PowerPoint slide
.sldm – PowerPoint macro-enabled slide
.ppam – PowerPoint add-in

Access

Microsoft Access 2007 introduced new file extensions:

.accda – Access add-in file
.accdb – Access Database
.accde – The file extension for Office Access 2007 files that are in "execute only" mode. ACCDE files have all Visual Basic for Applications (VBA) source code hidden. A user of an ACCDE file can only execute VBA code, but not view or modify it. ACCDE takes the place of the MDE file extension.
.accdr – is a new file extension that enables you to open a database in runtime mode. By simply changing a database's file extension from .accdb to .accdr, you can create a "locked-down" version of your Office Access database. You can change the file extension back to .accdb to restore full functionality.
.accdt – The file extension for Access Database Templates.
.accdu – Access add-in file