The registry can hold hundreds of thousands of entries. docx files, Windows would detail that selection in the registry so that it 'remembers' the default application. For example, if a user selects an application as the default program for a specific file type, such as selecting Microsoft Word to open. It is a huge configuration file that Windows uses to detail interactions with hardware, software and users.

In the simplest terms, the Windows registry is a database of settings and selections. Do not change or save any changes to a registry unless you are absolutely certain of the change. Improper changes to the registry can result in system instability and other functional problems. Warning: Before you attempt a Windows registry cleanup, it's important to note that the registry is a critical part of Windows systems. As a desktop administrator or Windows user, you should learn how the Windows registry works and review the best strategies for protecting and potentially optimizing a Windows registry.

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