This viewer supports reading of all Internet Fax files sent by the WorkCentre Pro 685/785, including the JBIG compressed files which may not open properly on other viewers. The tif image viewer installs as a secondary tif viewer. In order to view a tif image you should right mouse click of the .tif file, and choose 'Open with Fax viewer' If you are viewing from an application that does not present you with the 'Open with Fax viewer' option when you right click on it, you must save the file to disk and then right click on the image from explorer. If there is no tif viewer installed when this tif image viewer is installed, it will become the default tif viewer,and tif images should be accessed by double clicking on them, not by right clicking. Do not install this viewer if you have DocuLAN Fax 7.0 Personal Edition.