Move all files with .txt anywhere inside current folder

WIN10 has everything you need to do this built-in.

Start Powershell (right-click Start icon), and use the command:

PS F:\> Get-ChildItem -Path ".\*.txt" -Recurse | Move-Item -Destination "F:\TextFiles"

This should move all .txt extension files in your F: directory, and all sub-directories to whatever directory (folder) you specify such as 'TextFiles'.