A SPEEX codec is required for playback of the audio files.
The SPEEX Codec can be downloaded free of charge.
https://dl.dropboxusercontent.com/u/31491188/Speex/SpeexACM_1.0.1.1.7z
After the installation of the SPEEX codec, the audio file can be played with a playback software.
The audio files can be played with our ProPlayer software. With this application, you can play a digital dictation created with ProDictate Mobile quickly and efficiently.
http://www.devacon.eu/de/products/proplayer