Actionscript Classes not exporting

Afternoon all, first time poster here:cubs:

I would consider myself an intermediate flash/as user/developer (evidently not, with the hurdle I’m facing!!!).

I have recently received an fla to edit, which should be as simple as editing a text mistake on a movie clip, but has turned into a whole lot more! When I go to export a swf (without even editing the fla or any actionscript), the file plays back incorrectly - this is to say not playing back certain class functions.

I exported the swf with a size report, and I have noticed only one difference between the two: at the action script bytes and location … there is 1 part missing - ActioScript 2.0 Classes

Am I missing something here? All the classes are in the same folder I recieved them to and no edits have been made to the as in the file. Do I need to go somewhere to export the as 2.0 classes?

Any help on this matter will be greatly appreciated - I’m stumped!!! Scott.