How to convert WMA to VORBIS or OPUS?

My girlfriend accidently bought an audio book on the internet and she saved it on my hard disk in windows media audio format (.wma) and now she asks me how to listen to it. I'm a bit puzzled this format still survived. I'm on ArchLinux, kernel 4.2.1-1-ARCH. My first idea was simply trying to read it with VLC as it usually is a general problem solver for audio files and comes with a couple of codecs. But it didn't work. Second idea was converting, I usually use Audacity for quick format swaps, but after several attempts of exporting to ogg/vorbis or ogg/opus I noticed Audacity already failed to read the proprietary file format. I looked up the codecs section on arch wiki but it does not contain any hints for WMA. How to proceed? How to convert audio/x-ms-wma to audio/ogg, audio/vorbis, or audio/opus format?