how to use a game save file

hi there im quite a newbie and i dont know how to use a game save file i found on gamefaqs.. i downloaded one for my pokemon mystery dungeon (because i messed my own game) and the file is in .duc format..how can i use that???? its a game save file from the net.. sorry for the bad english no bashing please!thanks..

Search for a sav game file converter on google.

I'm not sure if Shuny's site is up again,
if not, google this, SaveTypeConverter.