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This app can't open. App can't be opened using the Built-in Administrator account.

The error message, "This app can't open.  App can't be opened using the Built-in Administrator account." is not a normal error message one would encounter in the use of their Windows 8/Windows 10 computer.  This issue is likely being manufactured by someone who modified Windows 8/Windows 10 by Disabling EnableLUA without a complete understanding of User Account Control and Admin Approval Mode.  To quote the popular website Windows IT Pro, "This is not a supported state of the OS and will block the modern applications-- so don't do this."

EnableLUA controls not only User Account Control but also Admin Approval Mode.  By default in Windows 8/Windows 10, EnableLUA is Enabled.  On the internet, there is the mistaken belief that setting EnableLUA to Disabled is an inocuous registry setting one can use to Disable User Account Control.  This is incorrect.  If EnableLUA is set to Disabled then Admin Approval Mode is Disabled which results in the error message: "This app can't open.  App can't be opened using the Built-in Administrator account."  Therefore, it can be understood that setting EnableLUA to Disabled results in functionality within Windows 8/Windows 10 to no longer function.  This includes built-in apps like Microsoft Edge, Clock, Calculator but also Control Panels like the Windows 10 Settings Control Panel.  Ultimately, it is a terrible idea to Disable EnableLUA because it impacts not just User Account Control but also Admin Approval Mode.

The proper method to disable User Account Control is to drag the User Account Control slider to Never Notify.  Dragging the User Account Control slider to Never Notify does not change EnableLUA from 1 to 0 therefore allowing Windows 8/Windows 10 to continue to function as it was designed by Microsoft.

To return Windows 8/Windows 10 to normal functionality:
  1.   Click Start - Run.

  2.   Type: regedit

  3.   Click OK.

  4.   Browse to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Current Version\Policies\System

  5.   If it does not exist, create a new DWORD (32-bit value) entitled EnableLUA and set the value to: 1

  6.   If it does not exist, create a new DWORD (32-bit value) entitled FilterAdministratorToken and set the value to: 0

  7.   If it does not exist, create a new DWORD (32-bit value) entitled ConsentPromptBehaviorAdmin and set the value to: 5

  8.   If it does not exist, create a new DWORD (32-bit value) entitled ConsentPromptBehaviorUser and set the value to: 1

  9.   Reboot.
This issue has been resolved.

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