I tested the following on my Mac, so it uses : instead of /, but it should provide the basis for what you need:

use strict;
use warnings;

my ($dir, $handle, %mlc, @files, @spider);

my $fname = "mlc";
# Main directory to start spidering...
push @spider, ':';

while ($dir = shift @spider) {
    if (-e "$dir$fname") {
        open($handle, "$dir$fname");
        $mlc{$dir} = join '', <$handle>;
        close($handle);
    }
    opendir($handle, $dir);
    @files = readdir($handle);
    closedir($handle);
    for (@files) {
        push @spider, "$dir$_:" if -d "$dir$_";
    }
}

for (sort keys %mlc) {
    print "$_\n$mlc{$_}\n\n";
}
[download]

Of course, you could make things much simpler and just cycle through all the directories with numbers 0 through x, where x is the maximum possible value:

use strict;
use warnings;

my (%mlc, $handle);
for (0..200) {
    if (-e ":dir$_:mlc") {
        open($handle, ":dir$_:mlc");
        $mlc{"dir$_"} = join '', <$handle>;
        close($handle);
    }
}

for (sort keys %mlc) {
    print "$_\n$mlc{$_}\n\n";
}
[download]

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