The DOCX format is the default file format for Microsoft Word documents in Word 2007 and Word 2010. You do not need to upload these documents online to convert them to DOC format. You can use the "Save As" feature in Word to save or convert documents to the DOC format, as well as other formats. To open and convert DOCX documents using Word 2003 or Word XP, you will need to first install the Microsoft DOCX Compatibility Pack. This pack is available as a free download from Microsoft.
Open the DOCX file with Word 2010.
Click "Save & Send."
Click to select "Word 97-2003 Document (*.doc)" under "File Types" to save it in a DOC format.
Open the DOCX file with Word 2007.
Click "Save As."
Click to select "Word 97-2003 Document (*.doc)" in the "Save as type" drop-down menu.
Verify that your Office XP or 2003 software is up to date by opening your Microsoft "Control Panel" from the "Start" button. Then click "Automatic Updates." Install any required updates as directed.
Download the Microsoft Compatibility Pack for Microsoft Office XP and 2003 (Microsoft.com).
Double-click the "FileFormatConverters.exe" file to install the compatibility pack.
Restart your computer. Then open the DOCX file with Word.
Click "File." Then click "Save As..."
Click to select "Word Document" in the "Save as type" drop-down menu.