Popup box will only let me save or open index.php in Database Settings

Hi. I have my zencart all installed into ...mydomain.com/catalog/ on my server & all is working well. But I have decided I need to move it ...mydomain.com/. I have installed all the original files & need it to link to my current database. During the install when I get to the Database Settings and click on the Save Database Settings I am getting a popup box saying:

You have chosen to open

index.php

which is a PHP Script
from http://mydomain.com

What should Firefox do with this file?
*Open with pHpfile (default)
*Save to Disk

When choosing to open it, it opens it with dreamweaver. Can anyone tell me how I can fix this? :cry:

Thankyou

Hi there, I am having a similar problem with firefox. Every time I go to the domain name where I have my zen cart site hosted it pops up a box which asks where I want to save it or open it. The only option is dreamweaver.

Does anyone have any solutions?

Thanks