For Excel 2010, Word 2010 or PowerPoint 2010
- Go to the Microsoft Download Center to download and install the OOXML Strict Converter for Office 2010.
- Open the file in Excel 2010, Word 2010 or PowerPoint 2010.
- Click Open when the following message appears.
- When the file opens, click Save As to save the file in Excel 2010, Word 2010 or PowerPoint 2010 default format.
The file that you are trying to open may have been created by a third-party (non-Microsoft) software product in compliance with the International Standard ISO/IEC 29500 Office Open XML (OOXML). Microsoft Excel 2007, Excel 2010, Word 2007, Word 2010, PowerPoint 2007, and PowerPoint 2010 do not support all the standards that are outlined by ISO/IEC 29500.
For more information about the adoption of the ISO 29500 standard by Microsoft, see the following Web sites:
Article ID: 967950 - Last Review: Dec 12, 2016 - Revision: 1