Homebrew Corrupt save files after using the AR DSI

[E-Block]

Alright, so I plugged in a microsd into my AR, extracted the save file from my game (transformers decepticons to be specific) and plugged it into my PC. Unfortunately, the AR uses .duc files, and not what I need. I wanted to test them using DesMuMe so I opened a converter (a downloaded one). I selected the .duc, selected AR DSI as the source, DesMuMe .dsv as the target, and converted. I tried loading the save file in desmume but It says ingame that the save data could not be read. I tried with another game and the same thing happened. Any help?

Thanks.