As apl says, adding use strict and use warnings is always a good practice.
I am curious about this fragment:
print "$FN[$k]\n";
$filename = <$FN[$k]>;
chomp ($filename);
$file->open("< $filename") or die("Can't read the source:$!");
The expression <$FN[$k]> reads from the file handle $FN[$k]. Do your files out-02-00.txt, etc. contain a file name or do they contain data? If the latter, I think you want just $filename = $FN[$k];.
Update: The following curiosity has been cleared up by duff below.
The curious part is that my testing shows that $filename is actually being set to $FN[$k] (cygwin-perl 5.8.8). However, this supposedly equivalent code sets $filename to undef:
...
$filename = readline($FN[$k]);
...
Update: Some more testing shows that if $f is the path of an existing file, then <$f> returns $f (assuming that $f has not been used as a file handle. Otherwise it returns undef. Ver interesting...
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