Creating an xdp file from flex/java application

Hi,
I have an application in Flex 4  and As 3.When I click a button in flex application I have to generate a file in java with
extension xdp.When I try this locally(Run as java application) the file is generating  correctly.When i compile the applic
ation and try it, the file is not writing correctly.Do someone have any idea about creating an xdp file from flex application?
i am using blazeds to connect java and flex4.When i opens the file in notepad the file is writing correctly.There is only problem in openig an xdp file...
please help me.

specifically:
Runtime.getRuntime().exec("filename.exe")

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