yes, you can specify critieria fpr including or excluding files on the command line for zipit.exe
not sure if you are using VB2005 or not, since zipit itself is a working application. you don't need to change it in order to use it. Also zipit is written in C#, not VB.
From the help message generated by zipit.exe, the selector is how you specify which files to include or not. Snip:
<selector> - a file selection expression. Examples:
(name = *.txt) OR (name = *.xml)
(attrs = H) OR (name != *.xml)
(ctime < 2009/02/28-10:20:00)
(size > 1g) AND (mtime < 2009-12-10)
(ctime > 2009-04-29) AND (size < 10kb)
So I guess you'd want to do something like (name != 'LargeFileYouDontWant.eee') as a selection criterion.