Can't install ... problem with Contact_Vcard_Build.php

Downloaded module and extracted tarball as usual, looked at ...

function _vcard_init() {
if (@include_once('Contact_Vcard_Build.php')) {
$vcard = new Contact_Vcard_Build();
}
return $vcard ? $vcard : FALSE;

Downloaded, renamed and placed the Contact_Vcard_Build.php in the same folder, clicked to admin/settings/vcard and a blank page appears, no source at all. Removed the Contact_Vcard_Build.php file and the admin/settings/vcard page shows asking for the said php file. What's wrong?