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

Cchen

after dowload games, how to open it's .mdf n .mds files?) X2 C4 k* ^. Q: F5 O
i cant open it?
2 i" H% C6 x( |, b( {0 p% H& F" o0 E5.39.217.76pls teach me...
$ h& a. M1 c7 _8 ^公仔箱論壇tq...