Enabling .NET 4 applications in IIS 6

I struggled with this long enough, and ended up guessing the right answer; maybe this will save someone else the trouble. On a Windows Server 2003 box, IIS 6, trying to get it to server .aspx pages from a virtual folder.  I could get .html files to serve just fine, but trying to hit an .aspx file kept returning a 404 Not Found Error.  I had to Open the 'Web Service Extensions' folder in IIS Manager, then 'Add a new Web service extension...' to add the .NET 4 application handling.  I used the following:

  • Extension Name: - "ASP.NET 4.0"
  • Rquired Files, Add - "C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll"

Once I saved the new extension, I had to click it again and 'Allow' it.  After that, .aspx pages starting serving up just like they should! 

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