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my %proc_data = (
    ID1 => [qw{location1 filename1}],
    ID2 => [qw{location2 filename2}],
    ...
);

for my $id (keys %proc_data) {
    my $location = $proc_data{$id}[0];
    my $filename = $proc_data{$id}[1];
    # file processing code here
}

use strict;
use warnings;

use diagnostics;