[kk_cz]

Just use Everything (https://www.voidtools.com/), so much better than Windows Search.

[layer8]

The latest version supports searching file contents now, though it's slow because the contents isn't indexed.

[mock-possum]

my favorite FOSS goto for searching contents in Windows is AstroGrep - https://astrogrep.sourceforge.net

[layer8]

It doesn’t seem to index either, though?

I normally use Notepad++’s Find in Files feature, which covers most cases, and also supports replacing.