Assuming you have ffmpeg installed, you could try somethiing like :
Code:
ffmpeg -i "input-file.wma" -acodec libmp3lame -ab 160k -ac 2 -ar 44100 "output-file.mp3"
where 'input-file.wma' is your test wma input file and 'output-file.mp3' is the test mp3 encoded output file.
or
Code:
ffmpeg -i "input-file.wma" -acodec mp3 -ab 160k -ac 2 -ar 44100 "output-file.mp3"
and assuming one of those lines worked (lets assume the one with 'libmp3lame' ), you could put all your .wma in one directory, and try:
Code:
for i in *.wma; do ffmpeg -i $i -acodec libmp3lame -ab 160k -ac 2 -ar 44100 ${i%.wma}.mp3; done