Sharepoint 2010 does not invoke ProcessRequest of my custom HttpHandler

Well, I know it's IIS which is supposed to invoke it. Anyway; I have a Sharepoint solution which is supposed to return a special string when files with particular extensions are clicked on document libraries.

In the corresponding web.config file I have following to run this HTTP Handler:

<system.webServer>
    <handlers>
        ...
        <add name="MyFileHandler" path="*.bar" verb="*" type="Foo.Example.MyHandler, Foo.Example, Version=1.0.0.0, Culture=neutral, PublicKeyToken=3b53a24010893ac2" resourceType="File" />
        ...
     </handlers>
 </system.webServer>
 

And the HttpHandler class is something like this:

namespace Foo.Example
 {
     public class MyHandler : IHttpHandler
         {   
             public MyHandler(){} //For breakpoint
 
             public void ProcessRequest(HttpContext context)
             {
                 //Do stuff and write to response.
             }
 
             public bool IsReusable
             {
                 get { return false; }
             }
        }
 }
 

When I try to open a file with '.bar' extension on Sharepoint, it returns 404. What I do in ProcessRequest is not relevant because when I debug the handler, I can see that the handler's constructor is invoked but not the 'ProcessRequest'. Besides the debugger I have also put debug lines(File.AppendAll), again only the constructor gets invoked according to the debug output.

IIS 7.5.7600

Sharepoint 2010 Foundation

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