It would be easier to write your own explorer then that what you questioned. If at all you wish to do this, you need a good understanding of the registry construction and windows api. File associations related to directories and the way windows explorer processes user actions. It is difficult to control, also you will need a good understanding of system folders and how they work.
In short :
1) You need control of the explorer window.
2) You need control over the tree view and have to pass the commands to it when you are finished.
3) You need control over the list view and have to pass the commands to it when you are finished.
4) You need control over the normal/pop-up menus and have to pass the commands to it when you are finished.
5) You need control over the mouse, which is the easiest compared to the rest of this.
And then the fun starts...
You should take a look at self built explorers, a few good ones are at
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p.s.
It's questions like this when I miss my C64 the most....