Use SED for Windowws in batch.

[briandams]

I prefer to cut down on learning curve of  using too many disparate tools, and stick to one language, with a lot of available APIs. Strawberry Perl Portable. No installation needed. Just one directory full of goodies.

[Geek-9pm]

ERRATA
This is rather late, but somehow it was not mentioned t in Windows you can not use the simple quote thin '
Instead  you have to us the double quote thing "

Also some versions of sed want  a g after the last /
so---
 sed s/123/789/ <OLD.TXT  >NEW.TXTBE
BE--
  sed "s/123/789/G" <OLD.TXT  >NEW.TXTBE

sorry 

For more about sed, see the archives:
https://www.computerhope.com/unix/used.htm