The User Account Control: Switch to the secure desktop when prompting for elevation policy setting is checked:. If the secure desktop is enabled, all elevation requests go to the secure desktop regardless of prompt behavior policy settings for administrators and standard users.
If the secure desktop is not enabled, all elevation requests go to the interactive user's desktop, and the per-user settings for administrators and standard users are used.
CreateProcess calls AppCompat, Fusion, and Installer detection to assess if the app requires elevation. The file is then inspected to determine its requested execution level, which is stored in the application manifest for the file. The AppCompat database stores information in the application compatibility fix entries for an application. The Fusion database stores information from application manifests that describe the applications.
The manifest schema is updated to add a new requested execution level field. Installer detection detects setup files, which helps prevent installations from being run without the user's knowledge and consent. Virtualization technology ensures that non-compliant apps do not silently fail to run or fail in a way that the cause cannot be determined. UAC also provides file and registry virtualization and logging for applications that write to protected areas.
The per-user file and registry virtualization redirects per-computer registry and file write requests to equivalent per-user locations. Read requests are redirected to the virtualized per-user location first and to the per-computer location second. Because system administrators in enterprise environments attempt to secure systems, many line-of-business LOB applications are designed to use only a standard user access token. As a result, you do not need to replace the majority of apps when UAC is turned on.
Windows 10 and Windows 11 include file and registry virtualization technology for apps that are not UAC-compliant and that require an administrator's access token to run correctly. When an administrative apps that is not UAC-compliant attempts to write to a protected folder, such as Program Files, UAC gives the app its own virtualized view of the resource it is attempting to change.
The virtualized copy is maintained in the user's profile. This strategy creates a separate copy of the virtualized file for each user that runs the non-compliant app. Most app tasks operate properly by using virtualization features.
Although virtualization allows a majority of applications to run, it is a short-term fix and not a long-term solution. App developers should modify their apps to be compliant as soon as possible, rather than relying on file, folder, and registry virtualization. Virtualization does not apply to apps that are elevated and run with a full administrative access token.
Virtualization supports only bit apps. Non-elevated bit apps simply receive an access denied message when they attempt to acquire a handle a unique identifier to a Windows object. Native Windows bit apps are required to be compatible with UAC and to write data into the correct locations. Virtualization is disabled if the app includes an app manifest with a requested execution level attribute.
An app manifest is an XML file that describes and identifies the shared and private side-by-side assemblies that an app should bind to at run time. The app manifest includes entries for UAC app compatibility purposes. Administrative apps that include an entry in the app manifest prompt the user for permission to access the user's access token.
Although they lack an entry in the app manifest, most administrative app can run without modification by using app compatibility fixes. App compatibility fixes are database entries that enable applications that are not UAC-compliant to work properly. All UAC-compliant apps should have a requested execution level added to the application manifest.
If the application requires administrative access to the system, then marking the app with a requested execution level of "require administrator" ensures that the system identifies this program as an administrative app and performs the necessary elevation steps. Requested execution levels specify the privileges required for an app. Installation programs are apps designed to deploy software.
Most installation programs write to system directories and registry keys. These protected system locations are typically writeable only by an administrator in Installer detection technology, which means that standard users do not have sufficient access to install programs. Windows 10 and Windows 11 heuristically detect installation programs and requests administrator credentials or approval from the administrator user in order to run with access privileges.
Windows 10 and Windows 11 also heuristically detect updates and programs that uninstall applications. One of the design goals of UAC is to prevent installations from being run without the user's knowledge and consent because installation programs write to protected areas of the file system and registry. Before a bit process is created, the following attributes are checked to determine whether it is an installer:.
The keywords and sequences of bytes were derived from common characteristics observed from various installer technologies. The User Account Control: Detect application installations and prompt for elevation policy setting must be enabled for installer detection to detect installation programs. Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services. If you want to enable or turn UAC on again, enter this command:.
However, before you do that, make sure you back up the registry to avoid any system issues. UAC makes all the difference between standard user accounts and administrator accounts. With the feature, you have a basic level system security that helps save your system from malicious processes even with a security suite in place. Elsie is a technology writer and editor with a special focus on Windows, Android and iOS.
She writes about software, electronics and other tech subjects, her ultimate goal being to help people out with useful solutions to their daily tech issues in a simple, straightforward and unbiased style. Read Elsie's Full Bio. We hate spam too, unsubscribe at any time. Table of Contents. The nature of User Account Control depends on the concept of developing multiple user accounts on an operating system, which began with Windows NT in Using User Account Control involves administering application requests, doing configuration and manually providing these specific status levels for users.
Microsoft has published guidelines for the use of User Account Control, and detailed tutorials online explain UAC settings as well as how to disable this feature on Windows operating systems. By: Justin Stoltzfus Contributor, Reviewer. By: Satish Balakrishnan. Dictionary Dictionary Term of the Day. Gorilla Glass. Techopedia Terms.
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