Anyone know how I can enable .asp files in a simple VS2010 Website project?

For example:

1. Start VS2010
2. Click "File/New Web Site..."
3. Accept defaults
4. Add an html file called "Test.asp"
5. Attempt to open Test.asp (debug project with that file active) and you get the following error:  "This type of page is not served. ... is not server because it has been explicitly forbidden. The extension '.asp' may be incorrect " <blah><blah><blah>

SO, HOW DO I EXPLICITLY ALLOW IT? VS2010 is using the ASP.NET Development Server....

TIA,