register the asp.net 4.0 on iss 5.1

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VB

ASP.NET

I have used following command
c:\>c:\windows\Microsoft.net\Framework\v4.0.30319\aspnet_regiis.exe -i
it creates a folder (named 4_0_30319)on C:\Inetpub\wwwroot\aspnet_client\system_web but does not has script files(why)
c:\>c:\windows\Microsoft.net\Framework\v2.0.50727\aspnet_regiis.exe -i
it creates a folder (named 2_0_50727)on C:\Inetpub\wwwroot\aspnet_client\system_web it has script files(why)