Install SparkIV

SparkIV : http://www.gtainside.com/en/gta4/tools/28310-sparkiv-0-6-6-iv-eflc/

Open SparkIV select your game at the top left.
Look for pc/data/cdimages open scipttxds.
import phone3d_hq_private0.wtd in there, click save
and you are done!
Enjoy!