The majority of the work I do is pure ActionScript, and doesn’t require the Flex framework. Its inevitable that someday one of these ActionScript projects will need to go local. In the past Zinc would have been the choice, but even the first version of AIR beats it considerably. So what do you do if you have an ActionScript project you want to do in AIR? It turns out that Flex Builder doesn’t have an option to create an ActionScript based AIR project. Luckily I’m not the only person who has run into this problem, there is an entry in the Adobe bug system detailing this exact issue. In the comments, there is a post that details exactly how to set up an ActionScript based AIR project in Flex Builder.
All you need to do is create a new Flex project, and change a file extension right before finishing set up. Once you name the project, click next. After you select the output directory, click next again and in the source path screen change the extension on the main application file from mxml to as.
After the project is created, you need to add code to have the project do anything (even create a window). Since its not done by default, here is some code to create a simple window:
var mainWindow : NativeWindow = new NativeWindow( new NativeWindowInitOptions() );
Thats it, thanks to Laurenţiu Lozan for the solution!