Long Mixer names (for capturing and port devices) are truncated to 31 symbols on windows (both 32 & 64bit)
playback device names are ok
=== Mixers.java ================================
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Mixer;
public class Mixers {
    static public void main(String args[]) {
        Mixer.Info[] infos = AudioSystem.getMixerInfo();
        for (int i=0; i<infos.length; i++) {
            System.out.println("mixer " + i + ": >>" + infos[i].getName() + "<<");
        }
    }
}
===================================================
results:
mixer 0: >>Primary Sound Driver<<
mixer 1: >>Realtek HD Audio 2nd output (Realtek High Definition Audio)<<
mixer 2: >>Realtek Digital Output(Optical) (Realtek High Definition Audio)<<
mixer 3: >>Speakers (Realtek High Definition Audio)<<
mixer 4: >>Realtek Digital Output (Realtek High Definition Audio)<<
mixer 5: >>Primary Sound Capture Driver<<
mixer 6: >>Mic in at front panel (Pink) (R<<
mixer 7: >>Stereo Mix (Realtek High Defini<<
mixer 8: >>Mic in at rear panel (Pink) (Re<<
mixer 9: >>Port Realtek HD Audio 2nd output (Re<<
mixer 10: >>Port Realtek Digital Output(Optical)<<
mixer 11: >>Port Realtek Digital Output (Realtek<<
mixer 12: >>Port Mic in at front panel (Pink) (R<<
mixer 13: >>Port Stereo Mix (Realtek High Defini<<
mixer 14: >>Port Speakers (Realtek High Definiti<<
mixer 15: >>Port Mic in at rear panel (Pink) (Re<<