Help!!! how to open .mdf n .mds files?

Cchen

after dowload games, how to open it's .mdf n .mds files?
" Y: o/ _( [; j4 m* F+ x( {5 \" |公仔箱論壇i cant open it?* E+ v0 h" W$ J% y& C0 z
pls teach me...
5 @- _" D. u; `( y2 m1 KTVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。tq...