February 12, 2011 
Definition:
function wp_get_attachment_thumb_file( $post_id = 0 ) {}
Retrieve thumbnail for an attachment.
Parameters
- int $post_id: Attachment ID.
Return values
returns:False on failure. Thumbnail file path on success.
Defined filters
- wp_get_attachment_thumb_file
apply_filters( 'wp_get_attachment_thumb_file', $thumbfile, $post->ID )
Source code
function wp_get_attachment_thumb_file( $post_id = 0 ) {
$post_id = (int) $post_id;
if ( !$post =& get_post( $post_id ) )
return false;
if ( !is_array( $imagedata = wp_get_attachment_metadata( $post->ID ) ) )
return false;
$file = get_attached_file( $post->ID );
if ( !empty($imagedata['thumb']) && ($thumbfile = str_replace(basename($file), $imagedata['thumb'], $file)) && file_exists($thumbfile) )
return apply_filters( 'wp_get_attachment_thumb_file', $thumbfile, $post->ID );
return false;
}
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A HitchHackers guide through WordPress 
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