Adobe Audition 2023 unable to open .ogg files

I'm not quite sure what you are trying to do here. Audition is perfectly capable of opening .ogg files (under Libsndfile), but when you say 'projects', what do you mean? Audition can only open sessions, and if you try to import an ogg file into a session, it will be decoded to a wav file anyway - because that's Audition's native format, and the only one it can operate in.