What is the name of the game you are trying to use them on. And did you format them properly? A headline should have !!# before it and all the cheats in that category should have a # before them. Also, all coments should have a ; before them. For example:
Code:
#!!-----Offline Codes-----
#Inf CE
;This is the code for infinite CE in FTB2
0x00517c3c 0x000f423f