ON XP:
- Open file in Notepad: C:\Program Files\Adobe\Adobe Dreamweaver {your version}\configuration\DocumentTypes\MMDocumentTypes.xml
- Find code <documenttype id="PHP_MySQL" servermodel="PHP MySQL" internaltype="Dynamic" winfileextension="php,php3,php4,php5" macfileextension="php,php3,php4,php5" file="Default.php" writebyteordermark="false"></documenttype>
- Add ,inc after both ,php5
- Save, close.
- Restart Dreamweaver.