Hey guys.

I dont know if this is old news, but i manged to get MC9 to play/encode aac file

First i went to http://rarewares.hydrogenaudio.org/, and under the aac i downloaded this file http://pessoal.onda.com.br/rjamorim/aacenc_v215.zip. If you unzip it and go to decoder\winamp there is a dll file called in_faad.dll . Copy it to the plugins folder in MC9 directory, or whereever you want it. Now that was pretty simple

Now go to media center, tool->plug-in manger, click on the button add plugins and find the plugin whereever it is on your hard drive. It should now show up under input files. Well enjoy

IT is also possible to encode throug MC9 with the aacenc.exe file in the zip. Just copy it to where you want it, and use it as a external encoder.
Tools --> Options --> Options --> Encodeing Choose Externam encoder as encoder and click on advance. Choose the aacenc.exe as your encoder.
Put in this line in the parameters:
-if %IN -normal -of %out
and put aac as extension