Hack for the EE Extension: File
Try changing line 496 from this:
$target_path = preg_match("/^\//", $f['server_path']) ? $f['server_path'] : PATH.$f['server_path'];
to this:
$target_path = preg_match("/(^\/|^[a-z]:)/", $f['server_path']) ? $f['server_path'] : PATH.$f['server_path'];
$target_path = preg_match("/^\//", $f['server_path']) ? $f['server_path'] : PATH.$f['server_path'];
to this:
$target_path = preg_match("/(^\/|^[a-z]:)/", $f['server_path']) ? $f['server_path'] : PATH.$f['server_path'];