Payload execution location!

[Dont Know <dkn4a1 () gmail com>]

hi list,

while using down_exec payload, wat i've seen is, it loads the actual payload into an exe named 'a.exe' wen the target 
machine is windows, and puts it into windows/system32

maybe, i don kno much abt it, but, how can i change the payload to give a customized file-location?

thanx in advance.
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