ASP.NET MVC on Cassini: How can I force the “content” directory to return 304s instead of 200s?

Scenario: I have an ASP.NET MVC application developed in Visual Studio 2008. There is a root folder named “Content” that stores images and stylesheets. When I run locally (using Cassini) and browse my application, every resource from the “Content” directory is always downloaded. Using Firebug, I can verify that the web server returns an HTTP 200 (“ok”).

How I do a sign an assembly that has already been built into a dll specifically flute.dll

The reason I want to sign the dll is because I want to add it to the Global Assembly Cache. The assembly is a css parsing engine written in Java and ported to J#. I use VS2008 so I can’t make J# projects. It doesn’t have a strong name key assigned to it and I have no idea how to do it now that it’s built.