Dreamweaver

Dreamweaver can edit your PHP, template and CSS files just fine, and in some cases (XTemplate, PHPTAL) with a graphical preview.

Find the Dreamweaver configuration files, MMDocumentTypes.xml and Extensions.txt. where they are depends on what platform is being used - the Find file function is your friend here.

For Dreamweaver CS3 you need to add the extensions by going to the edit menu > preferences. In the File Types/Editors section there is a place that identifies extensions you can "Open in Code View." Add the extensions listed below.

In Extensions.txt

Change the line ending in

In MMDocumentTypes.xml

you likewise want to add tal and xtmpl file types to the file type descriptions, e.g. change the line beginging documenttype id="HTML" to be

and likewise add .theme, .module and .engine to the appropriate section

The local copy of your site can now be edited in Dreamweaver.

Notes for Mac OS X

On OS X with CS3 installed, your Extension.txt is in

Macintosh HD/Users/{Your User Name}/Library/Application Support/Adobe/Dreamweaver 9/Configuration/

The MMDocumentTypes.xml is in

Macintosh HD/Applications/Dreamweaver CS3/configuration/DocumentTypes/

You might need to change the owner of this file (Right/Command Click + Get Info, Owner)

or in terminal
sudo chmod 777 MMDocumentTypes.xml

Related Dreamweaver Support Article

If you're interested in how Dreaweaver's file types can be tweaked then read this Adobe knowledgebase article (#tn_16410).