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windows/deployment/planning/creating-a-custom-compatibility-mode-in-compatibility-administrator.md
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title: Create a Custom Compatibility Mode (Windows 10)
description: Windows® provides several compatibility modes, groups of compatibility fixes found to resolve many common application-compatibility issues.
ms.reviewer:
manager: dougeby
ms.author: aaroncz
manager: aaroncz
ms.author: frankroj
ms.prod: windows-client
author: aczechowski
ms.date: 04/19/2017
author: frankroj
ms.date: 10/28/2022
ms.topic: article
ms.technology: itpro-deploy
---
# Creating a Custom Compatibility Mode in Compatibility Administrator
**Applies to**
- Windows 10
@ -27,19 +26,15 @@ Windows® provides several *compatibility modes*, groups of compatibility fixes
## What Is a Compatibility Mode?
A compatibility mode is a group of compatibility fixes. A compatibility fix, previously known as a shim, is a small piece of code that intercepts API calls from applications. The fix transforms the API calls so that the current version of the operating system supports the application in the same way as previous versions of the operating system. This can be anything from disabling a new feature in Windows to emulating a particular behavior of an older version of the Windows API.
## Searching for Existing Compatibility Modes
The Compatibility Administrator tool has preloaded fixes for many common applications, including known compatibility fixes, compatibility modes, and AppHelp messages. Before you create a new compatibility mode, you can search for an existing application and then copy and paste the known fixes into your custom database.
> [!IMPORTANT]
> Application Compatibility Toolkit (ACT) installs a 32-bit and a 64-bit version of the Compatibility Administrator tool. You must use the 32-bit version to create custom databases for 32-bit applications and the 64-bit version to create custom databases for 64-bit applications.
**To search for an existing application**
1. In the left-side pane of Compatibility Administrator, expand the **Applications** folder and search for your application name.
@ -48,14 +43,11 @@ The Compatibility Administrator tool has preloaded fixes for many common applica
## Creating a New Compatibility Mode
If you are unable to find a preloaded compatibility mode for your application, you can create a new one for use by your custom database.
> [!IMPORTANT]
> A compatibility mode includes a set of compatibility fixes and must be deployed as a group. Therefore, you should include only fixes that you intend to deploy together to the database.
**To create a new compatibility mode**
1. In the left-side pane of Compatibility Administrator, underneath the **Custom Databases** heading, right-click the name of the database to which you will apply the compatibility mode, click **Create New**, and then click **Compatibility Mode**.
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The compatibility mode is added to your custom database.
## Related topics
[Compatibility Administrator User's Guide](compatibility-administrator-users-guide.md)
[Compatibility Administrator User's Guide](compatibility-administrator-users-guide.md)