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64 lines
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64 lines
3.2 KiB
Markdown
---
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title: Install/Uninstall Custom Databases (Windows 10)
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description: The Compatibility Administrator tool enables the creation and the use of custom-compatibility and standard-compatibility databases.
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manager: aaroncz
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ms.author: frankroj
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ms.service: windows-client
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author: frankroj
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ms.date: 10/28/2022
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ms.topic: article
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ms.subservice: itpro-deploy
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---
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# Installing and Uninstalling Custom Compatibility Databases in Compatibility Administrator
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**Applies to**
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- Windows 10
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- Windows 8.1
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- Windows 8
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- Windows 7
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- Windows Server 2012
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- Windows Server 2008 R2
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The Compatibility Administrator tool enables the creation and the use of custom-compatibility and standard-compatibility databases. Both the custom databases and the standard databases store the known compatibility fixes, compatibility modes, and AppHelp messages. They also store the required application-matching information for installation on your local computers.
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By default, the Windows® operating system installs a System Application Fix database for use with the Compatibility Administrator. This database can be updated through Windows Update, and is stored in the %WINDIR% \\AppPatch directory. Your custom databases are automatically stored in the %WINDIR% \\AppPatch\\Custom directory and are installed by using the Sdbinst.exe tool provided with the Compatibility Administrator.
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> [!IMPORTANT]
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> 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 work with custom databases for 32-bit applications and the 64-bit version to work with custom databases for 64-bit applications.
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In addition, you must deploy your databases to your organization's computers before the included fixes will have any effect on the application issue. For more information about deploying your database, see [Using the Sdbinst.exe Command-Line Tool](using-the-sdbinstexe-command-line-tool.md).
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## Installing a Custom Database
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Installing your custom-compatibility database enables you to fix issues with your installed applications.
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**To install a custom database**
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1. In the left-side pane of Compatibility Administrator, click the custom database to install to your local computers.
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2. On the **File** menu, click **Install**.
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The Compatibility Administrator installs the database, which appears in the **Installed Databases** list.
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The relationship between your database file and an included application occurs in the registry. Every time you start an application, the operating system checks the registry for compatibility-fix information and, if found, retrieves the information from your customized database file.
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## Uninstalling a Custom Database
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When a custom database is no longer necessary, either because the applications are no longer used or because the vendor has provided a fix that resolves the compatibility issues, you can uninstall the custom database.
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**To uninstall a custom database**
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1. In the **Installed Databases** list, which appears in the left-side pane of Compatibility Administrator, click the database to uninstall from your local computers.
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2. On the **File** menu, click **Uninstall**.
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## Related topics
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[Compatibility Administrator User's Guide](compatibility-administrator-users-guide.md)
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