ADM (Administrative Templates) files are used to populate settings in the Group Policy Object Editor, so that you may manage registry-based policy settings. Each successive Windows operating system and service pack includes a newer version of these .adm files.

It used to be that you could only obtain the most recent .adm files by obtaining the latest service pack or operating system. However, they now make these .adm files are available on the Microsoft website.

Each set of .adm files is included in a Microsoft Installer (MSI) package available for download from here.