The fastest way on Windows to create a file with a list of all files in a directory and its subdirectories is pretty simple. This should work on most windows desktops. Open the Command Prompt ( Start button -> cmd ) and run the following command.
The /S switch searches all subdirectories.
The /B switch ommits all header and other stuff.
The > forwards all output to the specified filelist.txt file.
dir /B /S > filelist.txt
* For other switches check the output of
dir /?
Tested on a structure composed of 1,5M files. Works flawlessly.