I had an end-user demonstrate this problem in Windows 10 v1607 to me. It was pretty odd that they stumbled upon it but testing software really requires “infinite monkeys on infinite typewriters” to debug and test of all possibilities (or write Shakespeare).
We know that the Windows 10 Anniversary Update brought a redesign to the User Account Control window, adopting the UWP (Universal Windows Platform) look. With it, you get new features such as showing you the password that you entered. However, if you hold down the show password “eye” and hit enter to submit the password, you get different results. If you use “Run as different user” for an application (hold Shift and right-click on the application shortcut (no longer available on the new Start Menu)) and click-hold the “eye” while pressing Enter, Explorer.exe will crash and restart.
If you choose “Run as Administrator” as a non-administrator, enter a user name and password, then hold down the “eye” and press Enter, you will get an odd error:
C:\Users\[user name]\AppData\Local\Microsoft\Windows\WinX\Group3\01 – Command Prompt (name of application trying to run)
“This file does not have a program associated with it for performing this action. Please install a program or, if one is already installed, create an association in the Default Programs control panel.”
You can then click Ok and no action is taken. You will have to begin your “Run as Administrator” again, this time without holding down the “eye” in order to achieve the desired action.