How do I replace dnserror.htm in ieframe.dll with custom page

Question

I have a need to replace the dnserror.htm page with a custom page.  I need this for a tablet that will operate in Kiosk mode and have a specific web site on it.  I have edited the ieframe.dll.mui file using resource hacker and have confirmed that the changes are there.  However,  whenever I test it by turning off my computers internet connection and requesting a web page in IE, I get the original page. If I look at ieframe.dll.mui using Visual Studio it has an old page.  I found a way to get the full path to the page but the page doesn't exist where the path suggests.  (Under user/myname/appdata...) 

I really need to resolve this and all help is greatly appreciated.

John

Answer 1

I suspect what you're seeing is the dll cache noticing that you've tampered with a protected file and it restores the original.  

You've correctly divined that the pages are resources in IE dlls.  The proper way to handle this, I think, would be to implement a BHO that handles onBeforeNavigate.  In your handler check to see if you're being navigated to the error page (you could use IDocObjectService::IsErrorUrl() to verify, but I think just looking for dnserror.htm is good enough) and then cancel the navigation and instead navigate to your page, which would be a resource packaged as part of your BHO (either in the DLL via res:// or just a local file).

Answer 2

Thanks jeffdav.  I'll look into this.

Answer 3

I just worked through Microsoft's sample code on building a BHO and have a little bit of an idea of what you are talking about.  Could you provide a sample of the onBeforeNavigate?

Here is something I found elsewhere that suggests something similar:

void Explorer_BeforeNavigate2(object pDisp, ref object URL, ref object Flags, ref object TargetFrameName, ref object PostData, ref object Headers, ref bool Cancel)

        {

 

            if(URL.ToString().Equals(@"res://C:\WINDOWS\SYSTEM32\shdoclc.DLL/dnSerror.htm"))

            {

                Cancel = true;

                //navigate to my custom page

            }

        }

All help is greatly appreciated.