Problem with Default Document and IIS7.5/Windows 7

I'm having a problem with a component used开发者_如何学运维 in a Sitecore solution on our Windows 7 workstations that is driving me batty.

In short, the component in question adds <script> tags to the page that load supporting JavaScript files. The src attributes are set to something like:

/path/to/scriptgenerator/?r=1234&p=asdf

Those paths are not working - I'm getting a 404 back.

You might thing "oh ... well, the path doesn't exist." But it does, and it also has a Default.aspx page in it. In fact, if I try the following path, the JS is generated and returned by the server:

/path/to/scriptgenerator/Default.aspx?r=1234&p=asdf

We're testing the site using IIS7.5, not Visual Studio's debugging web server. Of course, on the production machines, which are Win Server 2008, things work just fine.

The component in question is a third-party component and I have no access to the source code, so I can't just modify it to append default.aspx to the SRC path.

I have checked to verify that Default.aspx is set up as a default document for the site, and it is.

I tried to work around the problem using ISAPI_Rewrite, but for some reason, rules that I set up for /path/to/scriptgenerator are ignored.

I've tried the solution described in these questions, and that has no effect on my problem: IIS 7 Not Serving Default Document ASP.NET 2.0 and 4.0 seem to treat the root url differently in Forms Authentication

I'm really not sure what to try or look for next ... any suggestions?

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Is this component set up within the same IIS Site as the Sitecore application?

If so, have you added path /path/to/scriptgenerator to IgnoreUrlPrefixes setting in web.config?