From the developer:
"EasyWMA converter is the ideal tool which allows you to convert your MP3, MP2, and WAV files to WMA format or convert WMA file back to WAV format. The tool is integrated with the Windows Shell and you can directly start conversion by right-click on the selected audio files and selecting 'Convert to WMA' from Windows explorer. The tool supports batch conversion mode and you can add multiple audio files and convert them in a batch.
"Version 1.22a contains minor enhancement and bug fix."