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my $file_name = @ARGV ? shift(@ARGV) : 'answerfile';
open(my $fh, '<', $file_name)
   or die("Unable to open answer file \"$file_name\": $!\n");

use File::Spec::Functions qw( rel2abs );

my $full_name = rel2abs($file_name);

use File::Basename qw( dirname );

my $dir_name = dirname($full_name);

E:\some\path>type ..\bin\routine.pl
use strict;
...
Dir Name:  E:\some\otherpath
Contents:
Answer file in \some\otherpath