The application Office Search it will help you find text from within Microsoft Office, RTF files and all text files in general.
You can do search in Microsoft Office (Word, Excel, Power Point), in LibreOffice (Writer, Calc, Impress), Visio, RTF but also in ASCII text files (TXT/CSV/ MD/HTML/PHP etc.). 
For all other files it will use fuzzy logic to check if the archive is text or binary. If you don't remember the file name, give a part of the text that is in the content, and it will display the contents of the matching files. The app runs on Windows 7/8 and 10.
Even if your folders are not meticulously arranged, you can easily find your documents as long as you remember a little of what they say.
If you know that certain file types are ASCII, you can add these file types to the config file so that you can search the application.
It supports characters Unicode/non-English, so you can use the app for Greek text as well.
