The trouble with Search Engines isn’t that the things you want to find aren’t there (they usually, but not always are) – the problem is wracking your brain to find the right bloody words to search for.
Still got there in the end – this is how you make Dreamweaver recognise CakePHP .thtml files as PHP – and give you the pretty colours you need and love.
http://friendsofed.infopop.net/2/OpenTopic?a=tpc&s=989094322&f=5283032876&m=3441048931
Locate the following file: C:\Program Files\Macromedia\Dreamweaver 8\Configuration\DocumentTypes\MMDocumentTypes.xml.
Open the file and locate the following line (around line 75):
macfileextension="php,php3,php4,php5" file="Default.php" writebyteordermark="false">
Change it to this:
macfileextension="php,php3,php4,php5,thtml" file="Default.php" writebyteordermark="false">
Save and restart Dreamweaver.