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In the first attempt, it looks like they were trying to run the application cmd.exe to get a listing of your directory. An example and explination can be found here:
--Edited to add--
Probably a better site:
Explains the UNICODE errors in more detail.
LOL... How sweet. I figured it was *something* like that, with the .exe suffix and all, but what are the odds of an .exe anything being installed on a Linux webserver? ;)