From Karl Brodowsky (bk1@ix.urz.uni-heidelberg.de)

umlaute.lzh contains the following files:

umlaute.sty
dosuml.sty
readme.ger
readme.eng

To use umlaut characters in a  TeX source  file it
is necessary to enable TeX to understand them.

Emtex  has this feature  built in  but  it is also
possible  to use   it for other  TeX by   the file
umlaute.sty which has to be included.

umlaute.sty for ISO
dosuml.sty  for DOS (Code Page 437)

Have fun  with  it,   distribute   it freely   and
complain to  your    sysop  if your TeX    is  not
eightbit-clean.