1) From the documentation:
my $zip = Archive::Zip->new( 'xyz.zip' );

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If a filename argument is passed and the read fails for any reason, new will return undef.
So, my $zip = Archive::Zip->new($file) or die "$file cannot be opened by zip\n" should do. The barfed bunch are not errors but warnings.

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

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