Migration from FlexSDK without changing flash player version.

• if you are using a window then here in the following path

C:\Program Files\Adobe\Adobe Flash Builder 4\sdks4.5.0\frameworks\libsplayer

HERE create a folder name with flash player version like "10.0 " and place a "playerglobal.swc" file into this folder.
and in the flash builder goto following option
project-->properties-->flex compiler
here set the flash player version like 10.0.0