An .o5r file must first be converted to another format (e.g., Rich Text Format for word processing or HTML for a browser) in order to be viewed. This is done exclusively using the document viewer . Do not open .o5r files with any other program.
If you have saved a document in the document viewer as a text, RTF or HTML file (right save button) but not as a .o5r file (left save button), you will be prompted before closing the document viewer to also save the report as a .o5r file, even though it is already saved in another format, because only from the .o5r file can you save the report again at any time in a different format or layout.