Html.ActionLink() != Html.BeginForm() for URL prefix

Question

Hi all!

This is my setup:

• IIS6 on Windows Server 2003
• iirf URL rewriter
• mapped .mvc extension to handle MVC pages (unchecked verify that file exists)
• no jolly catch-all handler

IIRF rewrites with the following rule (there is more, but it all boils down to this one, as far as MVC is concerned):

RewriteRule /(.*) /mvc.mvc/$1 [I,L]

Now, the problem: Html.ActionLink() produces nice links. Html.BeginForm() produces links which include "mvc.mvc".

Example: Html.ActionLink("test", "MyAction") produces: a href="/MyController/MyAction". But Html.BeginForm() produces action="/mvc.mvc/MyController/MyAction".

Why is that? Any hints to have BeginForm act similarly to ActionLink?

In case it matters, this is the final piece to make it work:

protected void Application_BeginRequest(Object sender, EventArgs e) {
  HttpApplication app = sender as HttpApplication;
  if (app != null)
    if (app.Request.AppRelativeCurrentExecutionFilePath == "~/mvc.mvc")
      app.Context.RewritePath(
          app.Request.Url.PathAndQuery.Replace("/mvc.mvc", "")
      );
}