function _cm_initialiseFileUpload ($fieldarray)
// perform any initialisation before displaying the File Upload screen.
{
    $this->upload_subdir      = 'pictures';
    $this->upload_filetypes   = array('image/x-png', 'image/gif');
    $this->upload_maxfilesize = 100;

    return $fieldarray;

} // _cm_initialiseFileUpload

<?php
$screen   = 'person.filepicker.screen.inc'; // file identifying screen structure
$subdir   = 'whatever';                     // subdirectory
$filetype = 'document';                     // file types to process

require 'std.filepicker1.inc';              // activate page controller
?>

switch ($filetype) {
    case 'image':
        $filemask = "(\.gif|\.jpg|\.png|\.bmp)$";
        break;
    case 'document':
        $filemask = "(\.pdf|\.doc)$";
        break;
    default:
        $errors[] = getLanguageText('sys0059', $filetype); // "Unknown filetype ($filetype)"
} // switch

function _cm_post_getData ($rows, &$where)
// perform custom processing after database record(s) are retrieved.
// NOTE: $where is passed BY REFERENCE so that it may be modified.
{
    // specify which file is to be downloaded
    foreach ($rows as $rownum => $rowdata) {
       	$rows[$rownum]['download_filename'] = $rowdata['picture'];
      	// 'inline' does not give any option to save
        //$rows[$rownum]['download_mode'] = 'inline';
    } // foreach

    return $rows;

} // _cm_post_getData