At the bottom of the window in w7 is start bar, there are icons and when right click is done on an icon of an application there is list of recently open. I want to modify of list of recently open for explorer, where or how can I do it?
The keys are not, as you already mentioned it, stored in the registry of Windows. My Fault.
I've found the program JumpListExtender very useful for your case. You can modify the Recent Open, the Pinned Items and the Jump List itself.