Really old ASND "resources" from a 68k Mac app

World Builder ASND resources are not related to Adobe Soundbooth. As far as I know, they are a much older format that is unique to World Builder. It becomes complicated because they were stored in the resource fork of a game file, not the data fork. Modern systems don't really have resource forks anymore so you'd need to extract the resources and convert them to a usable format.

This is possible only if you haven't inadvertantly separated the resource fork from the rest of the data fork at some point. OSX was able to handle them correctly for a while, but eventually dropped support. Windows and Linux just never understood resource forks, so usually the resource fork would get split off into a separate file in a .rsrc folder that would show up beside your file. It is very easy to accidentally lose these resource files if you don't know what they are. If you've managed to keep the files in a compressed Mac archive format like a Stuffit .sit file or maybe a .zip then you might be ok.

You can set up an emulator to run a 68k macintosh environment (there are guides online explaining how to do this). On an emulated 68k Mac, you can install a tool called "Sound Mover" which can open resource forks and also can read and convert World Builder's ASND resources. Sound Mover claims to be able to convert them to a standard Mac snd resource, and then convert that to a data file.

https://www.macintoshrepository.org/8252-sound-mover 

Once you've done that, you'd probably want to convert the files again into a more useful format like WAV or raw PCM or something.

FYI, I'm only here because I'm searching around for details about the ASND resource data structure so I can implement my own decoder, and google sent me to this question. I haven't solved my problem yet, but hopefully this helps you.

Well, you are quite correct as to what they are, and where they came from, but unfortunately Audition has never been able to open them. It's the Soundbooth equivalent of an Audition session file with audio data included and was unique to Soundbooth, although there's a rumour that CS6 version of Adobe Flash Professional could open them (up to a point) as well. I can't find any direct references to a Mac audio format of that name at all, though. Even if they used the format, the chances are that it would be nothing like what Adobe used it for. If you are convinced that these are Soundbooth files, then Soundbooth is what you are going to need; there is no alternative. This could be awkward; it's been dead in the water for some time now.