One way to do this, using PHP and javascript, is to have a page docfile.php which displays the MS Word file in the browser if the user is running IE, or brings up a download dialog for it otherwise.
On the page with the button, get it to use javascript to figure out whether the user is running IE or not, and send that information onto docfile.php via a GET request.
Then, in docfile.php, use a header to set the MIME type.
header("Content-type: application/msword");
Then, if the user is running IE, you can have it viewed in the browser with:
header("Content-Disposition: inline");
or otherwise:
header("Content-Disposition: attachment; filename=$filename");
to have it save to the local computer, where $filename is the name you want it to be saved as.
Then just throw in your content.
