How to find newest files in a directory, including subdirectories?

Like this: dir /s /o:-d

If you have cygwin or similar installed then find . -type f | xargs ls -tr will do the trick. You can almost certainly do similar with Microsoft's powershell.

In case you're using Everything, just type the path and sort by Date Modified and you will get all files in this folder in that order, regardless the subdirectory.