How to add phtml extension in dreamweaver

Open the following extension configuration file in a notepad and change the lines as specified below:

Step1
XP: Documents and Settings > [user] > Application Data > Adobe Dreamweaver > Configuration > extensions.txt

1. Add  :  HTM,HTML,SHTM,SHTML, ... ,TXT,PHP,PHP3,PHP4,PHP5,PHTML,JSP ... ,MASTER:All Documents

2.  Add : PHP,PHP3,PHP4,PHP5,TPL,PHTML:PHP Files

Step2
XP, Vista: Program Files > Adobe > Dreamweaver [Your Version] > configuration > DocumentTypes >
MMDocumentTypes.xml

<documenttype id="PHP_MySQL" servermodel="PHP MySQL" internaltype="Dynamic" winfileextension="php,php3,php4,php5,phtml"
macfileextension="php,php3,php4,php5,phtml" file="Default.php" writebyteordermark="false">;
</documenttype>