MSTech Search in Contents is a very convenient and useful software that helps you find the documents you need in the easiest and fastest way. You just need to specify your search path / several paths, enter the desired keyword or phrase and click the search button, after which you will have quick access to all documents containing your keyword.
You do not need to open any other software to view the contents of files, you can easily see the entire preview of the document, except for the search results column.