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44 lines
1.8 KiB
Markdown
44 lines
1.8 KiB
Markdown
---
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title: DLL rules in AppLocker
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description: This topic describes the file formats and available default rules for the DLL rule collection.
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ms.reviewer:
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ms.author: vinpa
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ms.prod: windows-client
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ms.localizationpriority: medium
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author: vinaypamnani-msft
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manager: aaroncz
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ms.topic: conceptual
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ms.date: 09/21/2017
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ms.technology: itpro-security
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---
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# DLL rules in AppLocker
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>[!NOTE]
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>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).
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This topic describes the file formats and available default rules for the DLL rule collection.
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AppLocker defines DLL rules to include only the following file formats:
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- .dll
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- .ocx
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The following table lists the default rules that are available for the DLL rule collection.
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| Purpose | Name | User | Rule condition type |
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| - | - | - | - |
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| Allows members of the local Administrators group to run all DLLs | (Default Rule) All DLLs| BUILTIN\Administrators | Path: *|
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| Allow all users to run DLLs in the Windows folder| (Default Rule) Microsoft Windows DLLs | Everyone | Path: %windir%\*|
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| Allow all users to run DLLs in the Program Files folder | (Default Rule) All DLLs located in the Program Files folder| Everyone | Path: %programfiles%\*|
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> [!IMPORTANT]
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> If you use DLL rules, a DLL allow rule has to be created for each DLL that is used by all of the allowed apps
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> [!CAUTION]
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> When DLL rules are used, AppLocker must check each DLL that an app loads. Therefore, users may experience a reduction in performance if DLL rules are used.
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## Related topics
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- [Understanding AppLocker default rules](understanding-applocker-default-rules.md)
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