Ok I was just looking for updates to all my programs and I remembered this. Anyway zip genius can do this with an add on here:
http://www.zipgenius.it/eng/?page_id=16And now I even get why you may want to do this:
QUOTE
Cutter can split large files into smaller parts so you will be able to transfer them by several ways, like storing them on removable media, or sending those parts as attachments to e-mail messages.
Makes sense to me.

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On another note I found out that zip genius will integrate with certain AVs. Sadly etrust wasn't one of them but I decided to try it anyway by installing the free edition of antivir(I already had the installer) and it works pretty well. Its a nice feature since a lot of people don't always check their files before unzipping.
(Other programs might do this as well but I'm not a heavy archive program user. I use it to unzip stuff and send the occasional email attachment)
List of AVs it will work with:
http://www.zipgenius.it/eng/?page_id=25