xltm – Excel macro-enabled template same as xltx but may contain macros and scripts xlsm – Excel macro-enabled workbook same as xlsx but may contain macros and scripts Excel-related file extensions of this format include:

OOXML Office Open XML (OOXML) format was introduced with Microsoft Office 2007 and became the default format of Microsoft Excel ever since. xlt – Legacy Excel templates officially designated 'Microsoft Excel 97-2003 Template' xls – Legacy Excel worksheets officially designated 'Microsoft Excel 97-2003 Worksheet' Although the latest version of Microsoft Excel can still open them, they are no longer developed. docb – Word binary document introduced in Microsoft Office 2007Įxcel Legacy Legacy filename extensions denote binary Microsoft Excel formats that became outdated with the release of Microsoft Office 2007. dotm – Word macro-enabled template same as dotx, but may contain macros and scripts docm – Word macro-enabled document same as docx, but may contain macros and scripts OOXML Office Open XML (OOXML) format was introduced with Microsoft Office 2007 and became the default format of Microsoft Word ever since. wbk – Legacy Word document backup referred as 'Microsoft Word Backup Document' dot – Legacy Word templates officially designated 'Microsoft Word 97 – 2003 Template' doc – Legacy Word document Microsoft Office refers to them as 'Microsoft Word 97 – 2003 Document' Although the latest version of Microsoft Word can still open them, they are no longer developed. Word Legacy Legacy filename extensions denote binary Microsoft Word formatting that became outdated with the release of Microsoft Office 2007. The following is a list of Microsoft Office filename extensions, used in Microsoft Office software suite as of January 2017.

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