According to Avid, the folders where AAX resides are the following:
Pro Tools 10 adds AAX format plug-ins (in addition to TDM & RTAS) so you will have 2 folders located here:
Macintosh HD/Library/Application Support/Avid/Audio/Plug-Ins (AAX)
Macintosh HD/Library/Application Support/Digidesign/Plug-Ins (TDM & RTAS)
C:\Program Files\Common Files\Avid\Audio\Plug-Ins (AAX)
C:\Program Files\Common Files\Digidesign\DAE\Plug-Ins (TDM & RTAS)
Now, I have just installed everything. When lauching Pro Tools, Cabbage fails to load because "...not a valid 64bit AAX plugin".
Okay, I am up to help you debug. According to Avid, every AAX plugin should be 64bit right? Something did not work (I hope it's not AAX's SDK identifying the use of open source software and just breaking it).