You can use Boxoft All to Wma Converter to batch convert kinds of audio format (APE, TTA, OGG, MP3, MAV and FLAC.) to WMA. it's so simple and small volume.
Add OGG format files you want by clicking "add" or "add folder";
Set output WMA settings: channels, format, bitrate, etc;
Catching above, you can also set output file properties such as title, artist, track, etc by clicking "option" button;