Has anyone succeed in sending .evt file content to graylog ?

Actually, I found that:

 - Using im_file module I can parse .evt file and send its content outside, but logs are bad formatted

 - Using im_vistalog module I can't parse .evt files only the Windows Event log, but logs are well formatted

Any advice someone ?

Maybe it is possible to send the ouput of im_file to im_vistalog ?

Thanks,
--
Mathieu