Have you put the DracoStory.exe.exe into the right direction e.g. C:\Nexon\Maple Story ?
Then, after having put it there, run the ~.exe and it works, or you've done something wrong (e.g downloaded the wrong Maple Story version).
Perhaps, the server may be offline, too.
To cheack this, you may use this cute litle tool in ogopogo's signature (I' sorry, if I haven't spelt this correctly). It tells you when the server is on-/offline.