one last question:
can I use a command line (DOS) to do the same ?

if so, what should be the formant ?

I can make self extracting spanned zip files (at 2 GB size) but the problem is I have around 400 of these to make and it will take me too much time, therefore I've been looking for a tool to make it.

Testing it on the mail server can be a great test - thanks a lot, looking forward for the results.

here is the story:
1. My customer has an old version of Winzip. He can not unzip files more than 2 GB size.
2. I am sending to this customers many games (hugh sized) which are more that 2 GB each.
3. what we did until now is to manually close zip files up to 2 GB and send them seperatly (so he can unzip them one by one). for example: a 7 GB game = 4 separate zip files.
4. He does not have tar or rar or any other unzip mechanizm nor he will not upgrade his winzip version to support more than 2 GB files.
5. I need the zip files to be stand alone - so I can open them by themsleves and not X.zip.001, X.zip.002 which comines together are a part of a bigger zip.
got it ?