For importing class of native process ,
Download sdk 3.4
Download AIR2.0 SDK
Now update air library of 3.4 with AIR 2.0 SDK - for that just copy of AIR2.0's sdk content and past this into SDK 3.4's content.
Now your library is able to handle native process.
Now you can import native process class.
When u want to call native process at that time u need to add
into your project app.xml
Now you can use nativeProcess class of AIR 2.0
I have tried with 3.4 also, My problem is when I try to import NativeProcess like “Import flash.desktop.NativeProcess” I am not able to get NativeProcess class in desktop package.
Be sure that you have updated new AIR 2.0 SDK and use this.
In this framework nativeProcess class is from SDK 's AdobeAIRSDK\frameworks\libs\air\airglobal.swc library.
I have updated my flex builder to 3.0.2 and its working