Depending on your configuration, Microsoft Word, Excel, and PowerPoint documents are displayed either using the standard Document Viewer or the Integrated Office Viewer. If your system is configured to use the WOPI endpoint to connect to the Microsoft Office Online Server or Office for the web (Office 365), the Integrated Office Viewer is used to display read-only versions of Microsoft Office documents. For more information about the Integrated Office Viewer, see your system administrator.
To use the standard Document Viewer to display a document, from an open document, select the Document Options Icon in the document title bar and select Launch Legacy Viewer.
Once you select this option, you cannot return to the Integrated Office Viewer until you close and reopen the document.
To use the Office Business Application to display a document, from an open document, select the Document Options Icon in the document title bar and select Launch Office Business Application option.
This option is only available if you are licensed for one of the Office Business Application modules.