The GermanWordlist.zip archive contains files used for the German
"endings" search algorithm.  They are:

 Length  Method   Size  Ratio   Date    Time   CRC-32     Name
 ------  ------   ----  -----   ----    ----   ------     ----
    552  Defl:N     285  48%  12-02-98  11:02  ed612fef   bad_words
 558008  Defl:N  168242  70%  02-12-99  09:22  5e6009eb   german.0
  27048  Defl:N    8493  69%  02-12-99  09:22  759f6d86   german.aff
 ------          ------  ---                              -------
 585608          177020  70%                              3      

For example, if you install them in common/german, you could use these
lines in your htdig.conf:

  search_algorithm:	exact:1 endings:0.5
  lang_dir:		${common_dir}/german
  bad_word_list:	${lang_dir}/bad_words
  endings_affix_file:	${lang_dir}/german.aff
  endings_dictionary:	${lang_dir}/german.0
  endings_root2word_db:	${lang_dir}/root2word.db
  endings_word2root_db:	${lang_dir}/word2root.db

You can build the endings database with "htfuzzy endings".  This command
may actually take days to complete.  Future releases of ht://Dig (3.1.2
and up) will use faster regular expression matching, which will speed
this up by a few orders of magnitude.