|Version XP26 of Robocopy has got these options:|
/MAX:n :: MAXimum file size - exclude files bigger than n bytes.
/MIN:n :: MINimum file size - exclude files smaller than n bytes.
It's a bit silly to re-invent the wheel every day, while there are tools pre-created to do that. Robocopy is not standard on XP, but you can download from MS sites, and it is standard in Vista and 7 (meaning it's not another 3rd party tool).
My advice is to actually test which file is biggest, not relying one of them being bigger than 2 MB, but that is just my idea.