Recently, I discovered that you can drag and drop files on Windows 11 with the right mouse button, and doing so reveals a special drag and drop menu.
Normally you would drag and drop them with the left mouse button, but I pressed the wrong button by accident and then a popup menu suddenly appeared. The menu gives you options to copy and create a shortcut instead of moving the file.
While this is pretty neat, personally I don't really think it's really useful since you can activate those same functions by holding modifier keys instead: Ctrl+Drop copies a file, while Alt+Drop creates a shortcut. So I'd have just ignored this and continued with my life. But since I have this website now, I decided to write it down that you can drag and drop things with the right mouse button as well.
That's actually quite neat because I don't think I've ever drag and dropped something with the right mouse button before. It's not the sort of interaction I'd expect to be supported or to do anything unique. But, in hindsight, now that I see it can be done, I wonder why it's not done more often. Drag and dropping things with the right mouse button should just display a popup menu for you to choose what you want to do with the thing. Why not? That probably solves some GUI design issues that you could have in some cases. It isn't a very discoverable feature since you're unlikely to try to drag and drop things with the right mouse button, but if users were taught that could be very usable.
In fact, maybe this is actually a convention that I just didn't know about. Maybe there are dozens of applications that do this, and I just don't know about it because I never tried it. Who knows!
Observations
For the sake of science I tried drag and dropping with the middle mouse button as well, but nothing happened. In fact, I can't even drag using the middle button.