From this tiny little glimpse, $maid_dir."\\".$maid."aln_hu.aln", note the concatenation "." operator, so there is a path to a file in the directory $maid_dir, this file is $maid appended to it is the postfix aln_hu.aln - .aln is the Clustal reports files format in Bioinformatics sequence alignment-

$maid_dir = 'C:\Documents and Settings\Blast_Clustal';
$maid = "report";
print $maid_dir."\\".$maid."aln_hu.aln";
[download]