You can actually get away with not knowing the content-type, you just default to application/octet-stream. Give the following a try, it is very nice. All you will need to do is perform a length() on the data and give a filename.

--eric

use CGI;
 
my $size = length ($blob);
my $filename = 'good_data.txt';
 
print CGI::header(
        -Content-Disposition =>  "attachment; filename=$filename",
        -Content-Type        =>  'application/octet-stream',
        -Content-Length      =>  $size,
        -Pragma              =>  'no-cache',
        -Expires             =>   0 );
print $blob;
[download]

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