Cann't open .dwt template file in IE

Hi,

I just upgrade my web development server to windows server 2003 R2 (I just

installed the first CD), and disabled the enhanced security configuration. I

am using dreamweaver MX 2004 as web development tools. Now, I cann't preview

template file by press F12.

Then, I tried right click on the .dwt file, and select open with..., then

select IE to open it. Then IE dosen't show up, and no message box to tell me

what's going on.

I then rename the file extension to .html, doublclick, it opened in IE.

I would like to know how can I let IE to show this template file in windows

server 2003. By the way, before I upgrade, I used windows server 2000, there

was no problem.

Thanks.

John