Microsoft Office Compatibility Pack is the combination of the many other add on.
Which is use for Office XP ,Office 2003 Microsoft Office 2000. You can edit them easily + open them in offices like the format PowerPoint , Excel ,Word and other offices are included which were in offices 2007 . You can download Unreal Engine from file hippo
Office Compatibility Pack 12.0.6514.5001
This is know as the tool which adds support of the versions of 2003 Viewer for the many PDF and other fro-mate.
Opener in which there are 3 viewer Excel, Word and PowerPoint and the files are PPTX ,XSLX, DOCX and DOCM.