Typical Office 2007 documents use 4 letter extensions. These include .xlsx for Excel, .pptx for Powerpoint and .docx for Word. Access however, uses .accdb as an extension, so it has 5 letters.
3
the Microsoft word files are called document
.DOCX
.doc
Create a new document in any of the office 2007 programs and save this document.
extension .docx
xlsx is the main extension used for Excel 2007.
.docx . They changed the extension from Word 2007. Meanwhile, you can choose to save the document in the old format (Word 1997-2003)
.docx, all Office 2007 have a "x" on the end.
doc for Word 2003 and docx for Word 2007
It is a macro-enabled workbook from Office 2007.
In Microsoft Office 2007 and 2010, the extension is .pptx, whereas in earlier versions it was .ppt.
Save document as .doc (not .docx)