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

after dowload games, how to open it's .mdf n .mds files?9 V$ M" B, \' q
i cant open it?TVBNOW 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。, G* ]. M- B! C% U# }- P
pls teach me...tvb now,tvbnow,bttvb* o# I2 E3 T2 e; g6 p
tq...