action replay on R4

hi i know how to do it but my computer won't save it as a .dat file no matter what these are the cheats i am wanting. Club Penguin: Elite Penguin Force. Dinosaur King. Farm Life. and Pokemon Platinum (UK).
thank youfor all help

1. download cheat editor here -> http://www.r4ds.cn/download/Cheat_code_editor.html2. save the file as usrcheat.dat3. copy usrcheat.dat into your _system_ on your SD card.

thank you :)