The Interoperability site provides content in several formats that require plug-ins, or separate browser components, to properly view. All required plug-ins (except the non-trial version of WinZip) are free to use.
The plug-ins used are:
Adobe Portable Document Format files (.pdf) -
Adobe Acrobat Reader
Microsoft Word documents (.doc) -
Word Viewer
Microsoft Excel spreadsheets (.xls) -
Excel Viewer
Microsoft PowerPoint presentations (.ppt) -
PowerPoint Viewer
WinZip files (.zip) -
WinZip