Known Issues in VRML Add-In 2.0 VRML Add-In 2.0 has been reported to hang with Diamond Viper PCI cards. For more information, click here to get to the Diamond web site. To uninstall Internet Explorer 2.0, you must first uninstall VRML Add-In. Some Web servers send gzipped files with the content-type of text/html. Microsoft VRML Add-In won't unzip these files in this case, and instead the application associated with the .gz file type will be launched or an "Unknown File Type" dialog will appear.