Hi David!  thanks for responding.  So here's what I could find out, and this will be rather verbose.

-I'll add pics for what I was attempting to do, and maybe the engineering team has thoughts on the matter.

Seems there's no real clear way to add a new Document Type.  And I believe the link you sent me are either out-dated, or possibly there are some missing crutial steps.

I LOVE DW!  So I'm not knocking it! 

Ok, here's what I've got....

This pic shows the New Doc options (CTL+N):

I'd love to see my new File Type inside that list, if possible. Perhaps the instructions are not meant for this type of extensibility.

I followed the instructions on this site:

http://helpx.adobe.com/dreamweaver/kb/change-add-recognized-file-exten sions.html

Adding the new file extension to the Extensions.txt file is the easiest part of this whole thing.  And it seems to work, for me to open something in DW, in code view only.

The MMDocumenttypes.xml file is an entirely different story.   Here's what I attempted to do:

I hightlighted the code I added, right below the HTML document type.  I honestly haven't seen any changes in DW, after restarting.

Also, I'm not sure what I should put for the <MMString:loadString id="???????" />   I noticed all the other documents had numbers incremented, so I followed suit.  Still not sure what it's actually doing.

In the end I want to see my new Document Type in here:

I'm expecting the "LUA" option to show in the "Document Type" list. 

And to make it even more complicated, here's this snapshot of the PHP selection:

After fuddling around inside the DW CS6 configuration files and folders, restarting the service, etc....... I'm wondering if I'm not really meant to add a new Language.  Perhaps I'm only really allowed to add a new Doc Type for simply opening the file in DW, but without color-coding options.

I'm still hopeful I'm just missing steps.

I've looked in several places for the "Styles" listed in that box above.  I simply cannot seem to find those styles in any xml docs. ( "ColdFusion Script Tag"........)

I know they are being defined, but finding them is another thing.

So, I read that PDF you sent me, and it was more informative, and I was able to make some tests.  But not the outcome I'm hoping for.

Up to this point I plan to still keep testing, but if your engineering team has easier insight, or better ideas, I'm all ears!

You're probably right.  The docs do seem to be meant for DW MX.

I'm fine with not adding a New File type to the New Document dialog box.

But I am very interested in adding a new File type to the Color Coding section.

I have a few languages I want to add, with their own color coding styles. 

If this is something that can't be supported for a while, it's fine.  But it would be nice to know.

Happy 4th of July!

If the engineering team does contact me, I'll probably be a loyal customer forever. 

Now that Adobe offers the Creative Cloud, I don't have to worry about latest updates and OS compatibilities.  I truly love DreamWeaver.

I know other DW users who have asked for the same thing.  (concerning color coding other languages)

Thanks David, I appreciate your help in this.

thank you Yalpi!   My development team is very interested to use DreamWeaver for other languages, and the syntax color-coding is an amazing help for us.   Allowing us to customize our own, or other languages will practically solidify us in the Adobe world.