When I try:
 mplayer -af resample=16000:0:2 -srate 16000 adlerian_psych.rm -ao pcm -waveheader -vo null -vc dummy -aofile outfile.wav

I get:
 MPlayer interrupted by signal 11 in module: read_subtitles_file

This files plays fine in RealPlayer (doesn't appear to have subtitles)...