Using Dreamweaver to edit your store theme
From Spiffy Stores Knowledge Base
Dreamweaver can view and edit the template files, but to be able to see the files in "Design view" in Dreamweaver, you need to add ".liquid" files to the list of files in the "html" section of the MMDocumentTypes.xml file.
There is a tech note on the Adobe site about how to do this at http://kb2.adobe.com/cps/164/tn_16410.html
After you have done this, you download your theme, unzip it, and open one of the files. It should display just like a normal HTML file.
Liquid tags are special tags that are used in normal HTML. All of the the templates that make up your theme are just HTML with Liquid tags in them, so you should be able to edit any of the template files in any HTML editor.
The theme.liquid file contains all of the layout information, and the other liquid files in the "templates folder make up each of the different types of pages in your site, such as...
- index.liquid (home page) - collection.liquid (collection pages) - product.liquid (product pages) - cart.liquid (shopping cart page) - page.liquid (normal pages) - blog.liquid (your main blog page)