The problem is not that the file cannot be read. The file can be read just fine. However, if it happens not to be a ZIP archive, the Archive::ZIP package spews half a screen of errors from various parts of itself, essentially complaining about the missing signature and going downhill from there.

In reply to Re^2: Checking if a file is present in a ZIP archive by bontchev
in thread Checking if a file is present in a ZIP archive by bontchev

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