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Added text about PE files.

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Andrea Bichsel 2018-08-27 07:58:05 -07:00
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windows/security/threat-protection/windows-defender-application-control/applocker/working-with-applocker-rules.md
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@ -6,8 +6,9 @@ ms.prod: w10
ms.mktglfcycl: deploy
ms.sitesec: library
ms.pagetype: security
author: brianlic-msft
ms.date: 09/21/2017
author: andreabichsel
msauthor: v-anbic
ms.date: 08/27/2018
---
# Working with AppLocker rules
@ -60,6 +61,8 @@ The AppLocker console is organized into rule collections, which are executable f
When DLL rules are used, AppLocker must check each DLL that an application loads. Therefore, users may experience a reduction in performance if DLL rules are used.
The DLL rule collection is not enabled by default. To learn how to enable the DLL rule collection, see [DLL rule collections](#bkmk-dllrulecollections).
EXE rules apply to portable executable (PE) files. AppLocker checks whether a file is a valid PE file, rather than just applying rules based on file extension, which attackers can easily change. Regardless of the file extension, the AppLocker EXE rule collection will work on a file as long as it is a valid PE file.
 
## Rule conditions