Have now successfully added QAAC audio encoder to the program.
This is piped from FFMPEG. All of it's features are added to the Audio Settings sub window once you select the encoder from the drop down menu.
I have also added some basic error windows for attempting to open un-supported file types.
This is complete for drag and drop as well as manually opening a file by selecting "Open File"
There could still be some missing file extensions that I don't know about, but currently it's a pretty decent sized list. If some more needs to be added please let me know so I can add them to the program ASAP.