For Windows, Google used to have something like that. Because it's Google, it has since been discontinued [1]. Mac's finder is close to what you have described

For Windows, Google used to have something like that. Because it's Google, it has since been discontinued [1]. Mac's finder is close to what you have described, and works reasonably well for me. On Unix, this sounds like something a grep one-liner (maybe with some document depacking/packing pipe for Office documents) would do. [1] https://en.wikipedia.org/wiki/Google_Desktop https://en.wikipedia.org/wiki/Google_Desktop