In drupal 6 you can use file_save_upload() function for saving your uploaded files.Instead of mannually accessing $_FILES drupal standard is prefered.
<?php
file_save_upload($source, $validators = array(), $dest = FALSE, $replace = FILE_EXISTS_RENAME);
?>
For making your custom form to work for file upload you need to set Enctype for your form in following manner:-
<?php
$form['#attributes'] = array('enctype' => "multipart/form-data");
?>
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