Comments on: The document type “php” will not be added because it uses a file extension that is already associated with a prior document type

By: Yun

Yun — Sun, 17 Apr 2011 12:19:02 +0000

This error message also appears when you make a backup of MMDocumentTypes.xml and leave it in the same folder as the original, as explained in Adobe’s KB:

Thanks alot for this great info.. you are a life saver

By: Trey

Trey — Thu, 23 Sep 2010 17:00:55 +0000

Incredible, useful information rW. And I could not find the information anywhere but here.

Thanks,
Trey

By: rsip

rsip — Thu, 22 Oct 2009 13:36:33 +0000

re: “This error message also appears when you make a backup of MMDocumentTypes.xml and leave it in the same folder as the original, as explained in Adobe’s KB”

thanx a lot rW for this information, very usefull!

By: Shashank

Shashank — Sat, 03 Oct 2009 21:34:49 +0000

Hi rW,

I was also getting the same error ‘The Document Type “HTML” will not be added because it uses a file extension that is already associated with a prior document type’.
I was going crazy because I was unable to figure it out why its coming as I am doing every thing fine. when I removed that copy file(backup file) of MMDocumentTypes.xml the error messages have been fixed. Now its working fine.

Thanks,
Shashank

By: Michael Jane

Michael Jane — Mon, 06 Jul 2009 18:26:43 +0000

Fantastic information,This is the first time i heard about this. keep it up this good works.

Thanks,
Micheal

By: rW

rW — Thu, 05 Mar 2009 21:58:49 +0000

This error message also appears when you make a backup of MMDocumentTypes.xml and leave it in the same folder as the original, as explained in Adobe’s KB:

“If you made a backup of the MMDocumentTypes.xml and left it in the Configuration/DocumentTypes folder, you will see multiple warning messages pop up when you launch Dreamweaver that look like this:

‘The Document Type “HTML” will not be added because it uses a file extension that is already associated with a prior Document Type.’

To stop these warning messages, move your backup copy of the MMDocumentTypes.xml file outside the Configuration/DocumentTypes folder. For example, move it to the desktop. You will also get this error message if you have the same file type listed more than once in the MMDocumentTypes.xml.”