audioread in Matlab on Unix machine
Unfortunately audioread does not support reading .wma files on Linux or Mac machines:
The error message you are getting here is not very informative either. Which version of MATLAB are you using? I believe in newer versions the error message is more helpful:
[y, Fs] = audioread('test.wma')
In R2013b for example the error message reads
Error using audioread (line 127)The file type is not supported