I want to make my application compatible with as2, so I think what I want to do is only use the features that as2 provides, how to specify the compiler or source code that I only use the features in as2?
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AS3 and AS2 are not compatible. You have to choose whether you use AS3 or AS2 in your project.
However, currently, there is almost no point in writing new projects in AS2, because Flash Player 9 reaches 99% penetration rates, according to Adobe
So, start a new project in AS2 only if you desperately need it for some reason. In all other cases AS3 is your weapon of choice.