<Li>. doc--Legacy Word document; Microsoft Office refers to them as "Microsoft Word 97 - 2003 Document" </Li> <Li>. dot--Legacy Word templates; officially designated "Microsoft Word 97 - 2003 Template" </Li> <Li>. wbk - Legacy Word document backup; referred as "Microsoft Word Backup Document" </Li> <Dl> <Dt> OOXML </Dt> <Dd> Office Open XML (OOXML) format was introduced with Microsoft Office 2007 and became the default format of Microsoft Word ever since . Pertaining file extensions include: </Dd> </Dl>

What is the extension of microsoft word document