Reorder your letters to put 'A' at the end. This is an improvement, not a perfect solution; you will only get the pop-up if `extracted` is not found at all. 
sub get_drive {
    for my $letter ( 'B' .. 'Q', 'A' ) {
        return "$letter:" if -e "$letter:/extracted";
    }
    return;
}

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In reply to Re: -e on windows giving error by Util
in thread -e on windows giving error by Rudolf

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