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---
title: Windows Installer rules in AppLocker
description: This topic describes the file formats and available default rules for the Windows Installer rule collection.
ms.localizationpriority: medium
ms.topic: conceptual
ms.date: 09/21/2017
---
# Windows Installer rules in AppLocker
>[!NOTE]
>Some capabilities of Windows Defender Application Control are only available on specific Windows versions. Learn more about the [Windows Defender Application Control feature availability](/windows/security/threat-protection/windows-defender-application-control/feature-availability).
This topic describes the file formats and available default rules for the Windows Installer rule collection.
AppLocker defines Windows Installer rules to include only the following file formats:
- .msi
- .msp
- .mst
The purpose of this collection is to allow you to control the installation of files on client computers and servers through Group Policy or the Local Security Policy snap-in. The following table lists the default rules that are available for the Windows Installer rule collection.
| Purpose | Name | User | Rule condition type |
| - | - | - | - |
| Allow members of the local Administrators group to run all Windows Installer files| (Default Rule) All Windows Installer files| BUILTIN\Administrators| Path: *|
| Allow all users to run Windows Installer files that are digitally signed | (Default Rule) All digitally signed Windows Installer files| Everyone| Publisher: * (all signed files)|
| Allow all users to run Windows Installer files that are located in the Windows Installer folder | (Default Rule) All Windows Installer files in %systemdrive%\Windows\Installer| Everyone| Path: %windir%\Installer\*|
## Related topics
- [Understanding AppLocker default rules](understanding-applocker-default-rules.md)