How do I delete a file in a zipfile

[Hans Nowak]

Howard Lightstone wrote:
> I can create zipfiles just peachy.
> 
> But, how do I delete/overwrite a file that already exists in a zipfile?

The documentation doesn't mention this, so I'm assuming you will have to create 
a new file, with all the original files minus the one that's to be removed.  I 
think this is how programs like WinZip do it; create a new file with temporary 
filename, delete the old file, rename the temp file.