title: Visual Studio Code: Treat other extensions as HTML
body: <p>For the purposes of syntax highlighting and colouring and intellisense is it possible to treat other extensions (tpl, master, etc) as HTML? </p>
  
  <p>I know it's possible on a file by file basis by pressing CTRL+SHIFT+P and selecting "Change Language Mode" BUT I want it to work off file extension, and not have to redo it every time I open a new file. </p>
  
  <p>I also know it's possible for some languages by editing the json files in the plugins directory, BUT there doesn't seem to be one for HTML.</p>