probably a bit late, but to throw a database in (DBD::CSV):

#!/usr/bin/env perl
use strict;
use warnings;
use DBI;
my $dbh = DBI->connect('dbi:CSV:', undef, undef, {f_dir => '/tmp', f_e
+xt => '.txt'}) or die $DBI::errstr;
my $select = $dbh->do('CREATE TABLE CombineDie1Die2 AS SELECT WL, BL, 
+Die1, Die_2 as Die2 from Die1_10k a, Die2_10k b Where a.WL = b.WL and
+ a.BL = b.BL') or die "Failed to execute - " . $dbh->errstr;
[download]

• The part "Die_2 as Die2" is because of the space in your File 2's field name
• This is a "inner join", thus WL,BL combinations are skipped if they exist in only one of the files
• for syntax see → SQL::Statement::Syntax (as http://sqlmonks.org seems to be dormant since its inception) :-)

Post Scriptum: OK, this example is convoluted, but the general advantage of SQL is: you can concentrate more on what you want to do with the data instead of how.

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