"Group by" a certain folder in windows explorer

What I am trying to do is to crate a folder for my application, and to make sure each time a user enters this folder, it's grouped, like this:

except that the disks would be replaced by some folders/files.

so basically I'm trying to achieve exactly what "Group by" function does:

and I have to do this in my application with c/c++ code or a bat. I'm guessing this needs to be done in the registry, but I cannot find where. any idea?

thanks.