you can try to decode the .aac with neroaacdec.exe (neroaacdec.exe -if audio.aac -of audio.wav)
i am not sure if it has support for raw .aac but if it has not you can mux the .aac to .mp4 with (mp4box.exe or mp4creator.exe) and it works for sure (neroaacdec.exe -if audio.mp4 -of audio.wav)
now you have a mutichannel .wav that can be properly downmixed to stereo with various tools (behappy)...
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