• Source: Administrative Template

Administrative Templates are a feature of Group Policy, a Microsoft technology for centralized management of machines and users in an Active Directory environment.
Administrative Templates facilitate the management of registry-based policy. An ADM file is used to describe both the user interface presented to the Group Policy administrator and the registry keys that should be updated on the target machines. An ADM file is a text file with a specific syntax which describes both the interface and the registry values which will be changed if the policy is enabled or disabled.
ADM files are consumed by the Group Policy Object Editor (GPEdit). Windows XP Service Pack 2 shipped with five ADM files (system.adm, inetres.adm, wmplayer.adm, conf.adm and wuau.adm). These are merged into a unified "namespace" in GPEdit and presented to the administrator under the Administrative Templates node (for both machine and user policy).




Syntax


A simple ADM example follows:

CLASS MACHINE
CATEGORY "Wikipedia Apps"
POLICY "Wikipedia"
KEYNAME "Software\WikiSoft\Preferences"
EXPLAIN "Configures WikiSoft Preferences"
VALUENAME "SharingEnabled"
VALUEON "Yes"
VALUEOFF "No"
END POLICY
END CATEGORY

A valid ADM file must have the following keywords:

Class - either MACHINE or USER
Category - Defines organizational structure of ADM and where it will be displayed in the GPEdit window.
Policy - Groups definitions into one node and configuration screen of the GPEdit tree
Optional keywords used include:

Keyname - used to define what registry key will be affected
View Filtering must be turned off in order to see custom preference settings (such as this example) in the Group Policy Editor.




ADM files across different platforms


It is important to note that ADM files shipped with Microsoft operating systems include descriptions of policy settings for not just that platform but for all other platforms on which Group Policy is supported. For example, the Windows XP Service Pack 2 ADM files described policy settings not just for this platform but also for Windows 2000 and Windows Server 2003. This approach allows management of machines that are running an operating system other than that on which GPEdit is used.




Managing ADM files


By default, ADM files are stored in each GPO, within Sysvol on domain controllers. This creates a simple and effective model for replicating ADM files across domain controllers (which is handled by the File Replication Service). However, in some instances this can cause operational issues. To this end, various policy settings are available to manage the manner in which ADM files are read and stored. These are described in Microsoft's KB article 816662.




ADMX files


Starting with Windows Vista, ADM files have mostly been replaced with ADMX files (and their associated language-specific ADML files). The ADMX file is structured in standard XML format, whereas the ADM files used a proprietary format.




References






External links


Important information about Windows XP Service Pack 2 ADM Files (KB 842933)
Recommendations for managing Group Policy Administrative Templates (.ADM) Files (KB 816662)

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