"Xamlviewer" folder is deleted after installing .Net Framework 3.5 SP1 on a Windows XP / Windows 2003 system – to know the reason, please click on the following link

http://blogs.msdn.com/smondal/archive/2009/08/31/xamlviewer-folder-is-deleted-after-installing-netfx-3-5-sp1-on-a-win-xp-win-2003-system.aspx

Content by : Soumitra Mondal