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

after dowload games, how to open it's .mdf n .mds files?5.39.217.77:8898& G9 X. i0 q1 t) v$ b* i f
i cant open it?" K4 g0 E0 b* P# Q Q
pls teach me...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。$ e# E# Z" V9 _- V' u
tq...