In FlashBuilder\'s compiler options (Properties->Flex Compiler), under \"Adobe Flash Player options\" there is an option for \"Use a specific version\", where you can tell it wh
This may or may not apply to your specific use case, you might need to explain what exactly you're doing. At any rate:
http://livedocs.adobe.com/flash/9.0/ActionScriptLangRefV3/flash/display/LoaderInfo.html#swfVersion