What effect does Actionscript 2.0 have on my code and projects?
Actionscript 2.0 was introduced with the release of Flash MX 2004. It is made up of mostly (about 98%) Actionscript 1.0, but with some new additions. Key new elements introduced were strict typing of variables, case sensitivity and class inheritance. These changes allowed Actionscript 2.0 to meet the ECMAScript 4 standard. In most cases, you can choose to publish your existing Flash projects as either Actionscript 1.0 or Actionscript 2.0 and your code will run as before. In fact, almost all Actionscript 1.0 and 2.0 can be published for, and played back successfully in, Macromedia Flash Player 6 or later. You should only run into problems if you did not match case, or use capitalization, in your code. Please refer to Errors when publishing for Macromedia Flash Player 7 (TechNote tn_18870) for more information on specific errors. Of course, if you add other new Flash 8 content, you must target Flash Player 8. For information on updating your Flash Player Detection scheme for Flash Player
