How do you copy the folder?
Copy & paste? Not likely to work as the clipboard buffer probably can hold that much stuff.
It do work for a single file, and usualy work when you sellect multiple files.
There is no guaranty that it can work with whole folders.
The time stamp WILL get changed as the copy is realy a new file unrelated to the original one.
Have-you tried to Drag & drop?
This always work and will copy all the files while preserving the original time stamp. It works whatever the number and levels of subfolders in the copyed folder.
Electro
June 2012