How to add .ahk2 file extension?

[Markymark]

I followed this guide to install Version 1.1.x and v2_alpha in parallel:

https://jacksautohotkeyblog.wordpress.com/2018/01/11/how-to-fool-around-with-the-new-autohotkey-version-2-0/

This is a fine setup so far ... except that SciTE4AHK does not recognize the .ahk2 extension!

Is there any easy way to let SciTE know that .ahk2 is meant to be the new file extension for v2_alpha. There are quite some .property files ... I was wondering if somebody can lead me a proven way.

Thanks in advance.

Rgrds,

Mark

P.S.: I see that the above link is broken for saftey reasons. Could not find a way to post the link so far. Sorry.

[Mod edit: LInk fixed.]