Just open your current user.properties file and add the below code to it. You can find out more about SciTE4Autohotkey here
For a quick review of how it works and how to add it you can check out this video
When working on longer AutoHotkey scripts, I love being able to just highlight some text and run only it. This is possible from making some tweaks to your User.Properties file and using this file by JoeDF.
Here is the text you’ll add to your User.Properties file:
Use the following for a webpage post:
Or you can download this AutoHotkey script
In the below video I walk through how to make updates to the User.Properties file as well as demonstrate Running selected text in SciTE.