I'm pretty sure you can alter/reverse engineer any compiled code.  I'll be back with a definite answer in about 9 hours!

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I wouldnt have thought so, surely some companies / military use bespoke compilers that couldnt be decompiled without knowing how its been compiled in the first place ? Im pretty sure its not that simple, if it was games companies would be decompiling other companies code all over the shop to see how they have achieved things ??

I could be very wrong though. 

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