Playing with a Custom Cube

Hi,
I created a .dck file that is a cube containing individual cards from many sets. I would like to be able to play with the file in Draft and Sealed Deck modes. However when I put the deck into the "cube" file, (/forge-1.4.2/res/cube) or the draft file, (/forge-1.4.2/res/cube), it does not come up in the menu for either. I am fairly new to forge so sorry if this is a repeat question.
I created a .dck file that is a cube containing individual cards from many sets. I would like to be able to play with the file in Draft and Sealed Deck modes. However when I put the deck into the "cube" file, (/forge-1.4.2/res/cube) or the draft file, (/forge-1.4.2/res/cube), it does not come up in the menu for either. I am fairly new to forge so sorry if this is a repeat question.