customError - 401.2 Access Denied

[Mark]

I'd like to avoid displaying the nasty built-in ASP.NET error for a 401.2,
access denied. We're using windows authentication. The error message that
is displayed by default is printed below. I'd love for it to redirect to
the 401-2_access_denied.htm file I've created in the root of my web site.
The text below is from my web.config file.

<customErrors defaultRedirect="error.htm" mode="On">
<error statusCode="401.2" redirect="401-2_myfile.htm"/>
</customErrors>

1. I've tried a statusCode of 401, 401-2, and 401.2.
2. I've tried absolute and relative paths to the .htm file. Relative should
work just fine as the web.config and .htm file are both in the root of the
site.
3. IIS custom errors do not appear to be leveraged whatsoever in this
situation when modified. This is further demonstrated by the fact that the
error message below doesn't jive with the default value for 401.2 in IIS
Custom Errors.

Suggestions?

Thanks in advance.
Mark

*** ASP.NET ERROR ***

Access is denied.
Description: An error occurred while accessing the resources required to
serve this request. The server may not be configured for access to the
requested URL.

Error message 401.2.: You do not have permission to view this directory or
page using the credentials you supplied. Contact the Web server's
administrator for help.