@echo off & setlocal enableextensions
  if not defined mytemp set mytemp=%temp%
  set sedcmd="%mytemp%\sedcmd.tmp"
  >  %sedcmd% echo s/ a/ A/g
  >> %sedcmd% echo s/ b/ B/g
  >> %sedcmd% echo s/ c/ C/g
  >> %sedcmd% echo s/ d/ D/g
  >> %sedcmd% echo s/ e/ E/g
  >> %sedcmd% echo s/ f/ F/g
  >> %sedcmd% echo s/ g/ G/g
  >> %sedcmd% echo s/ h/ H/g
  >> %sedcmd% echo s/ i/ I/g
  >> %sedcmd% echo s/ j/ J/g
  >> %sedcmd% echo s/ k/ K/g
  >> %sedcmd% echo s/ l/ L/g
  >> %sedcmd% echo s/ m/ M/g
  >> %sedcmd% echo s/ n/ N/g
  >> %sedcmd% echo s/ o/ O/g
  >> %sedcmd% echo s/ p/ P/g
  >> %sedcmd% echo s/ q/ Q/g
  >> %sedcmd% echo s/ r/ R/g
  >> %sedcmd% echo s/ s/ S/g
  >> %sedcmd% echo s/ t/ T/g
  >> %sedcmd% echo s/ u/ U/g
  >> %sedcmd% echo s/ v/ V/g
  >> %sedcmd% echo s/ w/ W/g
  >> %sedcmd% echo s/ x/ X/g
  >> %sedcmd% echo s/ y/ Y/g
  >> %sedcmd% echo s/ z/ Z/g
  rem
  >> %sedcmd% echo s/^^a/A/g
  >> %sedcmd% echo s/^^b/B/g
  >> %sedcmd% echo s/^^c/C/g
  >> %sedcmd% echo s/^^d/D/g
  >> %sedcmd% echo s/^^e/E/g
  >> %sedcmd% echo s/^^f/F/g
  >> %sedcmd% echo s/^^g/G/g
  >> %sedcmd% echo s/^^h/H/g
  >> %sedcmd% echo s/^^i/I/g
  >> %sedcmd% echo s/^^j/J/g
  >> %sedcmd% echo s/^^k/K/g
  >> %sedcmd% echo s/^^l/L/g
  >> %sedcmd% echo s/^^m/M/g
  >> %sedcmd% echo s/^^n/N/g
  >> %sedcmd% echo s/^^o/O/g
  >> %sedcmd% echo s/^^p/P/g
  >> %sedcmd% echo s/^^q/Q/g
  >> %sedcmd% echo s/^^r/R/g
  >> %sedcmd% echo s/^^s/S/g
  >> %sedcmd% echo s/^^t/T/g
  >> %sedcmd% echo s/^^u/U/g
  >> %sedcmd% echo s/^^v/V/g
  >> %sedcmd% echo s/^^w/W/g
  >> %sedcmd% echo s/^^x/X/g
  >> %sedcmd% echo s/^^y/Y/g
  >> %sedcmd% echo s/^^z/Z/g
  rem
  sed -f%sedcmd% < "My test file.txt"
  for %%f in (%sedcmd%) do if exist del %%f
  endlocal & goto :EOF

  >> %sedcmd% echo s/ å/ Å/g
  >> %sedcmd% echo s/ ä/ Ä/g
  >> %sedcmd% echo s/ ö/ Ö/g
  rem
  >> %sedcmd% echo s/^^å/Å/g
  >> %sedcmd% echo s/^^ä/Ä/g
  >> %sedcmd% echo s/^^ö/Ö/g