title: mvvm-light unable to create WP7 app "the project type is not supported by this installation"
body: <p>I have been trying to learn MVVM using Laurent Bugnion MVVM light method.
  I have installed binaries and templates (using latest version dated 23 Jan 2011)
  I can create WPF and SL4 projects but when I try to create a WP7 project VS2010 throws an error.
  "The project file c:\users\tonby\AppData\Local\temp\ime44m4x.2hg\Temp\MvvmLigh5.csproj cannot be opened.
  The project type is not supported by this installation.</p>
  
  <p>I have checked the template files are not blocked so unsure what to try next.</p>