$> mxmlc --help target-player
-target-player <version>
specifies the version of the player the application is targeting.
Features requiring a later version will not be compiled into the
application. The minimum value supported is "9.0.0".
You cannot determine the language. afaik - mxmlc version 3 is only the actionscript 3 compiler. There may be some backward compatibility, but it is not a combined AS2 and 3 compiler.
I’m not even sure what your third point really means, or really what you are asking as a whole.
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