Redirection doesn't work if you don't launch it inside a CMD.
So, your command line would look like this:
CMD.exe /C "<fullpathto>\MyCommand.exe /LOAD > C:\Temp\MyCommand.txt"</fullpathto>
Keep in mind that normal users are not allowed to create file in C:\Temp in Windows 7. Use the path returned by the TEMP environment variable instead. It will end up in the Temp folder in the users profile.