Hi my name is ***** ***** I can assist you. Have you tried the site, http://media.io ? It will convert most files to anything you want including .opus files.
Let me know if this works for you.
Hi Jason!Yes, I already tried this website too, and they didn't recognize it too :(
Can you upload the audio file to http://filedropper.com and send me the link? I'll see if I can convert it.