To be able to open the XPS document, you must have an XPS Viewer software. XPS files are portable document format, and is suitable for the exchange of documents, desktop publishing, documentation and many other useful functions.
For users of Windows XP or Windows 2003, XPS Viewer will automatically installed if you install Microsoft .NET Framework 3.0 or newer (i.e. .NET Framework 3.5). For Windows Vista and Windows 7 users, you do not need to install this framework because it is installed by default.