I have a game, it is in two folders, one named "CD1" and another one called "CD2". In each of this folders are two files, one "mds" and one "mdf". I had no idea what to do, so i did the following,

1. Extracted the mdf files with "isobuster" into a game folder.
2. Installed the game with the extracted files.
3. Tried to play the game.

When I tried to play the game the text, "Insert the correct CD" appeared. My question is simple. How can I play the game?
I would appreciate if those answering will explain in a "simple" way since I'm very inexperienced with these things!

Thanks for any help!