Interesting Windows Registry Keys

👉 Overview

👀 What ?

Windows Registry Keys are a hierarchical database that stores low-level settings for the Microsoft Windows operating system and for applications that opt to use the registry. The kernel, device drivers, services, Security Accounts Manager, and user interfaces can all use the registry.

🧐 Why ?

Understanding Windows Registry Keys is critical for those involved in system administration, cybersecurity, and software development. The registry contains information that Windows continually references during operation, such as profiles for each user, the applications installed on the computer and the types of documents each can create, property sheet settings for folders and application icons, what hardware exists on the system, and the ports that are being used.

⛏️ How ?

To use the Windows Registry, you can use the built-in Registry Editor tool (regedit.exe) that comes with Windows. This tool allows you to navigate through the registry just like a file system and to perform actions such as creating, modifying or deleting keys and values. Caution is advised when making changes to the registry, as incorrect modifications can cause serious system issues.

⏳ When ?

The Windows Registry was introduced with Windows 3.1 in 1992 as a way to centralize and standardize the system settings that had previously been scattered in various files across the system.

⚙️ Technical Explanations

Windows Registry is a hierarchical database that houses settings for the operating system and applications that choose to use it. At the heart of the registry are keys and values.

Keys resemble folders and subfolders, creating a hierarchical structure for data organization. They act as containers that house values or further subkeys. A registry key can be named anything and can be structured in numerous sublevels to form a detailed map of settings.

Values, on the other hand, are actual data entries stored within the keys. Named by the user, these values can hold various data types such as binary, string, multi-string, and more. For instance, a value might contain settings for how specific software should operate or system preferences.

The registry also contains special keys referred to as root keys or hives. Predefined, these keys act as the primary divisions in the registry. They bear special names and aren't physically stored on the disk. Instead, they're loaded into memory and mapped to certain registry locations when the system boots. These root keys usually contain critical system or application configuration information.

To modify the registry, use the built-in Registry Editor tool (regedit.exe) that comes with Windows. This tool lets you navigate the registry like a file system and perform actions like creating, modifying, or deleting keys and values. However, caution is advised when making changes to the registry, as incorrect modifications can cause serious system issues.

Remember that the Windows Registry was introduced with Windows 3.1 in 1992 as a way to centralize and standardize system settings that were previously scattered in various files across the system. Today, it remains a critical part of Windows operating systems.

In the Windows Registry, keys and values are organized in a hierarchical structure. Here's an example:

Consider the key HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\Folder\\. It can contain subkeys for specific versions of Office, such as 15.0\\Word, 16.0\\Excel, etc. Each of these subkeys can hold values that pertain to user settings for the corresponding application.

For instance, within HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\15.0\\Word, there might be a value named DefaultFilePath, which stores the default file path used when saving Word documents. Its data type could be REG_SZ (a string), and its data might be C:\\Users\\Username\\Documents.

To view or modify this using the Registry Editor:

1. Press Win+R to open the Run dialog box.
2. Type regedit and press Enter to launch the Registry Editor.
3. Navigate through the hierarchy to HKEY_CURRENT_USER\\Software\\Microsoft\\Office, then expand the 15.0 key, the Word key, etc.
4. In the right panel, you can see the values stored in the key. Double-click a value to view or modify its data.

Special keys, or root keys, are top-level keys in the registry. For example, HKEY_CURRENT_USER is a root key that contains configuration information for the currently logged-in user. These keys are loaded into memory when the system starts and are critical for system operation.

Warning: Always be careful when modifying the Windows Registry, as incorrect changes can cause system instability or other issues.

🖇️ Références