Esp. with raw substitution this kind of filtering is ideal for
sed stream editor. Only hassle is it's a Linux command. But you may find binary Windows ports. All you need is something that searches every file for the target character, such as
grep and when you find a hit, you pipe it into sed.
In fact the Windows port of the
find command will do it. Depends how much of this type of thing you need to do. If these types of tasks pop up all the time it may be worth setting up a Linux shell like bash that natively handles Linux command line binaries ported to Windows.
There are dozens of sed "one liners" you can find on the web that can do quite a bit when it comes to substitutions.
For a one-shot it's not worth it though.
