Notepad++: Assign syntaxhighlighting to data-extention

[MPREv]

Hallo Guys,
One of my favourite programs is notepad++.
It is quiet small and fast, but has a lot of functionality.
But now I have some Questions about it:
Notpad++ got syntax highlighting, that’s great!
Now I want to assign a highlighting schema (xml) to a special data extention (trvml).
So that if I open a trvml file the XML syntax highlighting is used.
Does anyone know how this could be done?

 

[fseal]

Look in the Notepad++ install folder under program files (x86).

Find the file called langs.xml

Change the properties on it so "users" have "full control".

Edit the file.

look for the "<Language name="xml" ext="xml xsml xsl xsd kml wsdl" commentLine="" commentStart="<!--" commentEnd="-->">" entry near the bottom

Add your new extension to the ext="..." list.

Save and restart Notepad++