windows version off AppImage ?
I use QT at work, but on a linux machine, and use AppImage to create a standalone exe file for linux. Is there such a tool that does the same for Windows ?
To achieve a single executable that "just runs" on Windows you usually statically link your app and add any needed resources (images, scripts etc.) using the resource system. No special app is needed for that.
That's the standard way to do it. It's the easiest, the fastest and makes least problems to the user.
If you can't do that for any reason you can also create a self extracting archive using one of the popular packers, e.g. 7zip (example here).