I’ve seen several people ask how to set up Flash Builder 4.5 to develop applications that use Flash Player 11 and AIR 3 features. Here are the steps:
- Download playerglobal.swc from http://www.adobe.com/support/flashplayer/downloads.html.
- Copy it to [Flash Builder 4.5]/sdks/4.5.1/frameworks/libs/player/11.0.
- In Flash Builder > Project > Properties > Flex Compiler, set the minimum Flash Player version to 11.
- In the Flex Compiler properties, specify an additional compiler argument:
Graeme Bull of FMSGuru.com has created an (always) excellent video tutorial that walks you through the steps: