Is this perhaps an XY Problem? Why can't you create your file foo/bar.txt and then create/add it to the archive?

To my (possibly flawed) understanding, you are correct that you cannot open a writable file inside a zip archive. This should make sense, given that compression algorithms in general need to analyze a complete file in order to determine how to compress the file effectively.

Perhaps File::Temp's tempdir would be helpful here?

#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.

In reply to Re: Creating files within a .zip by kennethk
in thread Creating files within a .zip by wumpus42

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