With Microsoft XPS Document Writer user can create .xps files using any program that run’s on Windows.
XPS document is a Microsoft document format to archive content in a standardized format or publish content in an easily viewable form.
In Windows 8 user can view & create XPS & OXPS files , the default format of XPS document in Windows 8 is .oxps , which is not supported by Widows 7 & Windows Server 2008 R2 .
But here is a good news for you , in order to open .oxps documents in Windows 7 , you have to install the OXPS to XPS Converter Tool .
So with the help of this tool you can convert the .oxps files into .xps files which you can view using Windows 7 XPS Viewer .
You can download the OXPS to XPS Converter Tool using following links .
For Windows 7 32 Bit ( x86 ) Click here
For Windows 7 64 Bit ( x64 ) Click here
For Windows Server 2008 R2 ( x64 ) Click here