Converting losslessy between WAVC and WAV - Possible?

[Masquerade]

Hello, on behalf of a friend I would like to ask if it's possible to convert audio files in *.wavc format into standard *.wav format and back into *.wavc without harming the audio quality.

I have tagged a sample below of some *.wavc audio in the hope someone knows a way of converting this file type.

They have already tried WinAMP with the .acm plugin, howeverr that didn't work - and Audacity couldn't read the file.

Thank you in advance and have a wonderful day!