Wilhelm has been updated this year but the links I found for it were in error.
this link is where you can get it http://www.geocities.com/rba_schach2000 ... nglish.htm
It has it's own Gui and plays a good game of chess, i used it mainly to check tablebase's . but have to admit i now use the engine..http://www.geocities.com/rba_schach2000/index_english.htm