Delete folders from zip file

[tim.calderwood]

I am trying to processes 300 zip files that I need to delete a folder out of. I know how to loop through the files but for the life of me, I can not figure out how to use the zip function to delete a folder out of a zip file. The folder name is 'external' and I need to delete it and all of the files that are located in that folder. Because these zip files are relative large, ie 400megs, I rather not extract, delete, then zip again if at all possible.

Thanks