File Download dialog launched errantly

[Kirby, Stephen \(Civ, ARL/CISD\)]

Hi,
 
I am using a WML file as my welcome-file.  When I try to launch the web
page I'm getting a "File Download" dialog for some reason.  (it's
tomcat-5.5.9 and it shows tomcat works fine when I leave the welcome
file as index.jsp)
 
The web.xml already had the MIME mapping for wml extension files so I
don't think that's the problem. 
(from web.xml)
     <mime-mapping>
        <!-- WML Source -->
        <extension>wml</extension>
        <mime-type>text/vnd.wap.wml</mime-type>
    </mime-mapping> 
 
I've triple-checked the wml file and can't see anything wrong:
 
<?xml version="1.0"?>
<!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.1//EN"
"http://www.wapforum.org/DTD/wml_1.1.xml";>
<wml>
 <card id="myFirstCard" title="First Card">
  <p align="center">
   Hi there......
  </p>
 </card>
</wml>
 
I've seen mention of a http.conf file -- is that relevant to jakarta
tomcat; if so what line is added to recognize wml?
 
TIA
-Steve