I've converted the files on my PC to the AAC format using Pazera Free Audio Extractor, with the settings as specified on Nintendo's site, and put them on my SD card, but my system won't play them; instead, I get a message saying it couldn't find any compatible AAC files. Can I get some help with this?
If you are still having problems with this, please check out my thread (at the above url) that has more suggestions on AAC music conversion programs that I have personally tested to make sure all will work perfectly, are easy to use and and will allow you to play your songs on the DSi, the XL, Wii console and even the 3DS too.
While you really should listen to "One-of-three", I also have found that the basic Real Player Converter works wonders. Only had one problem once with one song, just reformatted it again and it worked fine.