Unlike the good old Start menu in Windows 7, the Start menu in Windows 10 does not come with any option to add the Run command. Many users prefer to have a clickable item to open the Run dialog. It can be useful especially for mouse and touchpad users who really miss the Run item in Windows 10's Start Menu. I already covered how it could be done in early Technical Preview builds of Windows 10. Here are updated instructions to add the Run command to the Start menu in Windows 10 RTM.
How to add Run to the Start menu in Windows 10 RTM
You can use the All apps list. Open the Start menu and go to All Apps -> Windows System. There you will find the Run item:
Right click it and you will be able to pin it to the Start menu or to the taskbar in Windows 10:
Tip: see how to disable web search in the Windows 10 taskbar.
That's it. You are done.
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