Help using HTTP_Download

I need some help on how to use the HTTP_Download class.
The following code is in a file download.php.
The download question looks like this:
Open 'http://www.domain.com/download.php' (attachment)?

[Open] - gets the correnct data.
[Save as] - gets an error box.
Already saving URL
http://www.domain.com/download.php

// code from download.php
$dnld = "String with data to download";
$params = array();
  $params['data'] = $dnld;
  $params['contenttype'] = "Content-Type: text/tab-separated-values; 
charset=ISO-8859-1";
  $params['contentdisposition'] = "Content-Disposition: attachment; 
filename=contacts.tsv";
  $http_dnld = new HTTP_Download($params);
  $http_dnld->send();

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