how to search keywords inside a docx document??

I mean. I have many many docx documents under a directory. I can remember there is one keywords in the lines of the document, but I don't know which document it is. And the filename does not contain the keyword. How can I find out which document it is among many docx files

For example. I've got 100 files and their filenames are 1.docx 2.docx 3.docx ..... 100.docx

and I know in one of the files there are keywords "Happy", but I don't know which file it is, but I don't want to go over each file and search for it otherwise ti will be very painful

I don't use it, but I thought the standard Windows search capability would do that, if you had indexing turned on.

Have you tried it--or any other tool?

dafydd said:

Have a look here
voidtools

That's a fabulous tool and the only search tool I use.

But it finds file names only. Not words within files----unless the newer versions have that capability.

Edit:

Hmm....maybe it will. The current help file says:

Content Searching

Warning: content searching is extremely slow.
File content is not indexed.

So I don't know how well it works in practice for file contents--compared to the Windows tool.

dafydd said:

Have a look here
voidtools

unnecessary . windows itself done. thanks anyway.