The famous Windows searcher is well-known among users, but isn't as good as we would hope. Often when you are looking for a specific word in a file, it can't find it.
Windows Grep guarantees to do an exhaustive analysis of the files you indicate when looking for any character chain you want to find, whatever the file type: HTML, DOC, RTF, MDB, XLS and even EXE runnables.
Windows Grep has a versatile and effective configuration which even allows you to replace a text chain for another you indicate in all the files it finds.