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 Recently I tried running Virtual Server 2005 R2 on Vista Ultimate edition, the program installed ok but I was unable to start the Virtual Server Administration site. It prompted me Open or Save vswebapp.exe
  
In order to fix the same you need to do the following: 
·       Add IIS features on an existing Windows Vista OS 
·       Add an IIS handler mapping so it will treat EXE files as CGI 
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