Viewing XPS documents
If .Net Framework 3.0 is already installed on a system (Windows Vista, Windows XP SP2, or Windows Server 2003), an XPS document will open within the Microsoft XPS Viewer. In most cases, that viewer is included within the Internet browser Internet Explorer 7. Plans for other browsers to include XPS viewing capabilities exist, but, at this time Mozilla Firefox 2.0 does not yet offer an XPS viewing extension. In our experience, on our Windows Vista RTM system, Internet Explorer 7 must be the default Web browser for XPS documents to render automatically within the browser.
We experienced numerous glitches and application crashes upon downloading and installing .Net Framework 3.0 on our Windows XP SP2 test system. And on our laptop with Windows Vista RTM, which included .Net Framework 3.0, we did not find the XPS option native within Microsoft Office Word 2007; instead, we had to download and install an additional component.
.Net Framework 3.0, when it runs, does provide extensible-graphics capabilities such that XPS documents can be magnified, allowing you to scale both text and images without jagged edges. XPS Documents viewed within Windows Vista call upon the Windows Vista printer subsystem, to provide faster, higher-quality output of graphically-intense documents. This is possible because of a new spooling mechanism within Windows Vista that first sends complex parts of the document to the printer for fast rendering.