as all you have to do is have a copy of Microsoft's programming tools or other publishers such as Borland (which contain the file you need) or by downloading and installing the Windows Server 2003 Resource Kit Tools (don't let the name bother you as they are fully compatible with Windows XP).

You will then have and be able to use the file COMPRESS.EXE to compress files as Microsoft does and EXPAND.EXE for expanding them.

Here is a link to the Resource kit tools -
http://www.microsoft.com/downloads/details.aspx?FamilyID=9d467a69-57ff-4ae7-96ee-b18c4790cffd&displaylang=en