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Copy file name to clipboardExpand all lines: msix-src/app-installer/How-to-create-custom-app-installer-ux.md
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---
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title: How to create a custom App Installer UX
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description: A document describing how to create the custom UX xml file and how to add it to your MSIX package to create a custom look and feel for your App Installer installs.
Copy file name to clipboardExpand all lines: msix-src/app-installer/app-installer-security-features.md
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App Installer displays a warning banner to the user whenever the user is installing a package from the internet. When the internet warning is shown, users should be careful to verify that the source listed on the dialog is trusted.

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Installing software from an untrusted site on the internet can be risky and expose you to malware and other exploits. For more information, see [Protect yourself from online scams and attacks](https://support.microsoft.com/office/protect-yourself-from-online-scams-and-attacks-0109ae3f-fe61-4262-8dce-2ee3cd43bac7)
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## Microsoft SmartScreen Reputation-based URL Validation
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The App Installer now takes advantage of [Microsoft SmartScreen](https://learn.microsoft.com/windows/security/operating-system-security/virus-and-threat-protection/microsoft-defender-smartscreen/) to help users make informed decsions before installing software.
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The App Installer now takes advantage of [Microsoft SmartScreen](/windows/security/operating-system-security/virus-and-threat-protection/microsoft-defender-smartscreen/) to help users make informed decsions before installing software.
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Prior to downloading a package from an Internet source, App Installer will consult Microsoft SmartScreen's URL Reputation service.

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When presented with this error, the user can choose to **Cancel** or **Continue** (Not recommended).
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When a user attempts to open a blocked URL, they will be presented with the following dialog.
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The App Installer access to URL Security Zones is controlled by the [DesktopAppinstaller CSP](https://learn.microsoft.com/windows/client-management/mdm/policy-csp-desktopappinstaller#enableappinstaller). If an App Installer attempts to load a URL from a zone that is blocked, the user will be presented with an error.
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The App Installer access to URL Security Zones is controlled by the [DesktopAppinstaller CSP](/windows/client-management/mdm/policy-csp-desktopappinstaller#enableappinstaller). If an App Installer attempts to load a URL from a zone that is blocked, the user will be presented with an error.
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IT Professionals can add sites to the Restricted or Trusted Sites Zone by use of the [policy-csp-internetexplorer](https://learn.microsoft.com/windows/client-management/mdm/policy-csp-internetexplorer). If a URL appears in a zone that is blocked, the App Installer will block installation.
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IT Professionals can add sites to the Restricted or Trusted Sites Zone by use of the [policy-csp-internetexplorer](/windows/client-management/mdm/policy-csp-internetexplorer). If a URL appears in a zone that is blocked, the App Installer will block installation.
Copy file name to clipboardExpand all lines: msix-src/app-installer/app-installer-ui-dialog.md
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---
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# App Installer User Interface
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The App Installer provides the user interface for installation of [MSIX packages](https://learn.microsoft.com/windows/msix/overview). The interface is defined to provide the user with critical information about the package in order to make an informed decision about installing the application.
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The App Installer provides the user interface for installation of [MSIX packages](/windows/msix/overview). The interface is defined to provide the user with critical information about the package in order to make an informed decision about installing the application.
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The App Installer interface consist of the following features:
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The application name is provided by the app author, and extracted from the [MSIX file.](https://learn.microsoft.com/windows/msix/overview)
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The application name is provided by the app author, and extracted from the [MSIX file.](/windows/msix/overview)
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## Microsoft Store signature
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If the dialog shows the string, "Microsoft Store App", you know the application has been successfully built and distributed through the Microsoft Store. Microsoft Store Signed Apps have been tested and comply with the [Microsoft Store Policies](https://learn.microsoft.com/windows/apps/publish/store-policies)
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If the dialog shows the string, "Microsoft Store App", you know the application has been successfully built and distributed through the Microsoft Store. Microsoft Store Signed Apps have been tested and comply with the [Microsoft Store Policies](/windows/apps/publish/store-policies)
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## Publisher name and Version
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The publisher name and version are provided by the app author, and extracted from the [MSIX file.](https://learn.microsoft.com/windows/msix/overview)
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The publisher name and version are provided by the app author, and extracted from the [MSIX file.](/windows/msix/overview)
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## Source
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The source provides the domain of the URL that the package was sourced from. This allows the user to decide whether they trust the source when deciding whether to install the package.
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## Capabilities
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The listing of the [capabilities](https://learn.microsoft.com/windows/uwp/packaging/app-capability-declarations) allows the user to evaluate what the application can access on your PC before installing it. If the application is accessing a capability you do not agree with, it is recommended you choose cancel.
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The listing of the [capabilities](/windows/uwp/packaging/app-capability-declarations) allows the user to evaluate what the application can access on your PC before installing it. If the application is accessing a capability you do not agree with, it is recommended you choose cancel.
Copy file name to clipboardExpand all lines: msix-src/app-installer/installing-windows10-apps-web.md
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## App Installer Security
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With version <bugbug> of the App Installer, the following security measures have been added:
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With Build 1.24.1981 of the App Installer, the following security measures have been added:
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* Internet Zone validation
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* Microsoft SmartScreen Validation
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### Microsoft SmartScreen Validation
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If the domain referenced by the *ms-appinstaller* URI scheme is allowed, the App Installer will validate the URI with [Microsoft SmartScreen](https://learn.microsoft.com/windows/security/operating-system-security/virus-and-threat-protection/microsoft-defender-smartscreen). URIs that fail the reputation check will present the user with an error.
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If the domain referenced by the *ms-appinstaller* URI scheme is allowed, the App Installer will validate the URI with [Microsoft SmartScreen](/windows/security/operating-system-security/virus-and-threat-protection/microsoft-defender-smartscreen). URIs that fail the reputation check will present the user with an error.
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See [App Installer security features](./app-installer-security-features.md) for more information.
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