I have been frustrated when editing .module and other non .php suffixed files that Dreamweaver doesn't colour code?! So here is how to make Dreamweaver do so.
In Dreamweaver's application directroy follow to here: Configuration\DocumentTypes\MMDocumentTypes.xml
In here (MMDocumentTypes.xml file) you should find the lines of code which list the currently accepted suffix formats for php colours to be applied to.
Something like this: winfileextension="php,php3,php4" or "macfileextension="php,php3,php4"
Insert "module" onto the end of these like so: winfileextension="php,php3,php4,module" or macfileextension="php,php3,php4,module"
Restart Dreamweaver and it should nicely colour code .module files as php ones.
