Windows
Compatible applications
Quick Facts
Basic information about this file format
Extension
.ADM
File Type
Group Policy Administrative Template
Category
Data
Best first step
Use compatible software
Quick Summary
A practical overview of the .adm file format
An ADM file is a Group Policy Administrative Template used by Microsoft Windows operating systems to define registry-based policy settings. These files contain configuration instructions that dictate how the Group Policy Object (GPO) Editor displays policy settings in the user interface and how tho…
File extension
.ADM
File type
Group Policy Administrative Template
Category
Data
Recommended action
Open with a trusted compatible app
How to open a .adm file
Start with a trusted app that supports this format
- Check the file extension carefully and confirm that the file name really ends with .adm.
- Use software that supports this file type. If one app does not work, try another compatible program for the same platform.
- Update the application if the file was created by a newer version of the software.
- Scan files from unknown sources before opening them, especially documents, archives, scripts, installers, and executable files.
What is a .adm file?
File extension details and usage information
An ADM file is a Group Policy Administrative Template used by Microsoft Windows operating systems to define registry-based policy settings. These files contain configuration instructions that dictate how the Group Policy Object (GPO) Editor displays policy settings in the user interface and how those settings are applied to the Windows Registry. ADM files are written in a proprietary, plain-text markup language. System administrators use them to manage and enforce system configurations, security policies, and software behavior across a network of Windows computers. While widely used in older versions of Windows (such as Windows XP and Windows Server 2003), the ADM format has been largely superseded by the XML-based ADMX and ADML formats in newer versions of Windows (Windows Vista and later). However, legacy ADM files are still supported for backward compatibility and can be imported into modern Group Policy management consoles.
Software Compatibility
Programs that may open or work with .adm files
macOS
Compatible applications
Linux
Compatible applications
Mobile
Mobile applications
Can .adm files be converted?
Options for saving or exporting this file to another format
In many cases, a .adm file can be converted by opening it in compatible software and using an option such as Save As, Export, or Convert. The available output formats depend on the file type and the application used.
- Use the original software that created the file when possible.
- Check whether the application supports exporting to common formats.
- Be careful with online converters when working with private, business, or sensitive files.
- If conversion fails, the file may be corrupted, incomplete, encrypted, or not actually a .adm file.
Why can't I open a .adm file?
Common reasons this file type may not open correctly
Wrong software
The file may require a specific program that supports the .adm format.
Incorrect extension
The file extension may have been renamed manually, even though the actual file format is different.
Corrupted file
The file may be incomplete, damaged during download, or transferred incorrectly.
Outdated app
Your software may need to be updated before it can open newer versions of this file format.
Frequently Asked Questions
Common questions about .adm files
To open a .adm file, use software that supports this file format.
- Microsoft Group Policy Object Editor
- Microsoft Notepad
- Notepad++
- Microsoft Local Group Policy Editor
- Apple TextEdit
Open the file in compatible software and look for options such as Save As, Export, or Convert. If no export option is available, the file may require a specialized converter or the original application that created it.
- Verify that the file extension is correct.
- Install or update compatible software.
- Try another application that supports this format.
- Check whether the file is corrupted, incomplete, or encrypted.
A file extension alone does not guarantee whether a file is safe or unsafe. Only open files from trusted sources, scan unknown files before opening them, and be especially careful with executable, script, archive, and document files.
File safety tips
Use caution with unknown files
Only open files from trusted sources. Before opening a .adm file, scan it with antivirus software, verify that the file extension is expected, and avoid running unknown executable, installer, macro-enabled document, or script files.