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

Cchen

after dowload games, how to open it's .mdf n .mds files?
- @( g* Z" S( S  V; si cant open it?
: O; |& B9 ~3 F. g1 ]" MTVBNOW 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。pls teach me...: B  m* y1 b# c  P7 ]
tq...