LIttle confused I think but im guessin that;
you want to use accesss to copy a file into an existing
zip file.
I think this may be possible in that access would likely
have a command to run an exe file. i.e. zip.exe
And the zip program likely has some switches to allow you
to run the exe file without having to use the gui system.
Here what my version of ZIP help says
Note: at the time of this writing, the command line
support add-on has still not been officially released,
but a pre-release beta test version is available as a
free download from the web page
http://www.winzip.com/wzcline.cgi.
The WinZip Command Line Support Add-On lets you use
WinZip's® power within batch files, macros, and other
situations where you have a specific task and would
prefer to accomplish it quickly or automatically, without
using the usual WinZip graphical user interface.
Copyright © 1991-2000 by WinZip Computing, Inc. All
rights reserved.
