can I install .net 3.0 extensions on Visual Studio 2003?

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The extensions for .net framework 3.0 (templates to create .net 3.0 applications, like WPF, WCF, WF) only work with Visual Studio 2005.

You may look at this site https://www.microsoft.com/downloads/details.aspx?FamilyId=F54F5537-CC86-4BF5-AE44-F5A1E805680D&displaylang=en under the system requirements.