dngrep/dngrep ? reverse-engineered prompt

Build me a Windows desktop app that works like a visual grep tool.

I want to be able to search through lots of files and folders for plain text, regular expressions, XPath, and phonetic matches, and see the results in a clean, easy to use interface. It should handle common document types too, like Word, Excel, PowerPoint, PDFs, and archives, not just plain text files. Make it feel like a practical file search tool for everyday use, with the ability to open matches, navigate results, and search quickly across big sets of files.

Please make it feel polished and reliable, with support for the usual Windows workflows. If you need to check current docs or library guidance while building it, go ahead and look things up online. Also keep privacy in mind, so it should not send user data anywhere unless the user clearly asks it to.