I'm using the Flash Bulder 4.0.
I've checked the version in AIR SDK Readme.txt file, and you were right, it was 1.5.2
I've tried to use this http://blogs.adobe.com/cantrell/archives/2011/03/how-to-use-air-2-6-wi th-flash-builder-4.html to get the 3.2 functionality, and Flash Builder now have the nativeProcess in flash.desktop, but now it won't compile.
Make sure the project thinks it is building a 3.2 app and not something like 1.x
I'm new to Flash Builder, can you please tell me where can I specify the version? I've looked nearly everywhere, but I haven't found it.