ADM files exist as 2 different types. Please find information about each of them below.
Type 1: Portfolio Admin-Level Access Flag
The adm file extension is used by the After Dark screen saver application for Windows and Mac OS X. This type of file stores MultiModule screensavers. After Dark is an obsolete product that is no long...
The adm file extension is used by the After Dark screen saver application for Windows and Mac OS X. This type of file stores MultiModule screensavers. After Dark is an obsolete product that is no longer actively used or supported.
The adm file is created when an Extensis Portfolio Catalog (FDB file) is open in admin mode. It should be automatically deleted when the Catalog is closed. But it may be deleted manually if not removed after closing.
Adm files can also be Microsoft Group Policy templates. They describe where registry policy settings are stored. Adm files also define the interface administrators see when creating or modifying Group Policies.
An .adm file defines the settings the Group Policy Object Editor displays. It indicates the registry location where the settings are stored. If the application offers management capabilities through ....
An .adm file defines the settings the Group Policy Object Editor displays. It indicates the registry location where the settings are stored. If the application offers management capabilities through .adm files, it must store policy settings under HKEY_CURRENT_USER\Software\Policies or computer-specific keys.
The ADM file format describes both the interface and the registry values changed if the policy is enabled or disabled. ADM files are text files consumed by the Group Policy Object Editor. Windows XP Service Pack 2 shipped five ADM files merged into a namespace in the editor.
ADM files facilitate managing registry-based policies. They are template files describing the interface and registry values updated on target machines. System administrators use them to define policies for computer groups.
You can open ADM files using the Microsoft Group Policy Object Editor. ADM files are unicode text files that specify the location of settings in the Windows registry. They have been replaced by ADMX files.
Microsoft Group Policy
Policy Editor