On the right side, select the Open checkboxes for the file types that you want to open in the Protected View. Now, select the Open selected file types in Protected View radio button at the bottom.

If you cannot open an Excel file and see Excel cannot open the file because the file format or extension is not valid error, see this post.

Citing statements of support from more than 300 companies and organizations, Microsoft claimed on Tuesday that interest in its Office Open XML file format continues to grow. Comments backing the ...

Microsoft is trumpeting support for its Office Open XML document file format as an international standard from more than 300 companies and organizations on a new "community" Web site set up by the ...