You will have to do your modification in two steps:

  1. Write your changed version to a new file
  2. Overwrite the original file with your changed version

Also, I think that Sharepoint automatically inserts markers into files that look like (zipped) XML to track whether a file was copied/renamed and still reference the history.

In reply to Re: Modify zip file in memory by Corion
in thread Modify zip file in memory by rv799cv

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