FSCommand Works with Win 7 but does nothing with Win XP

I have built an application where in i embbed a swf file into my C sharp win Forms application. The problem i am having is that FSCommand [I know i need to use external interface, but this swf is built by some one else] does not respond on XP machines while it works perfectly with Windows 7. My code is available here

http://stackoverflow.com/questions/7555139/c-application-works-on-win-7-but-not-on-xp

I have no clue why this happens and i have been racking my head over this for quite some time now.

Please Help.