.reg file | A text file in the Windows registry-file format that describes keys and values. O&O RegEditor exports branches to .reg files and imports them again; the files are compatible with the Windows Registry Editor. |
| Address bar | The input field above the key tree that shows the path of the selected key and jumps to any path you type or paste. It remembers recently used paths. |
| Auditing | A list of users or groups whose access to a key is recorded by Windows. Managed in the advanced security settings. |
Binary value (REG_BINARY) | Raw binary data, edited as a grid of hexadecimal bytes. |
| Branch | A key together with all of its subkeys and values. Export, search and delete work on whole branches. |
| Configuration file | OORegEditor.cfg, the file in which O&O RegEditor stores its own settings, either next to the program (portable) or per user. |
| Default value | The unnamed value every key has, shown as (Default) in the value list. It cannot be renamed or removed, only edited. |
DWORD (REG_DWORD) | A 32-bit number, typically used for flags, counts and small numeric options. |
| Effective access | The permissions a user or group actually has on a key once inheritance and all permission entries are taken into account. |
Expandable string (REG_EXPAND_SZ) | A string in which environment variables such as %SystemRoot% are replaced with their current value when the string is used. |
| Favourite | A saved link to a key or value in the Favourites menu for one-click access. |
| Frequently used keys | A built-in submenu of the Favourites menu with commonly needed registry locations. |
| Hive | One of the five main keys at the top of the registry tree (HKEY_CLASSES_ROOT, HKEY_CURRENT_USER, HKEY_LOCAL_MACHINE, HKEY_USERS, HKEY_CURRENT_CONFIG). Also called root key. |
| Inheritance | The mechanism by which a subkey takes over the permission entries of its parent key. |
| Key | A container in the registry, comparable to a folder. A key holds values and further subkeys. |
| Key tree | The hierarchical view of keys on the left of the main window. |
| Main key | See hive. |
Multi-string (REG_MULTI_SZ) | A list of strings, edited with one entry per line. |
| Owner | The account that ultimately controls a key and can always change its permissions. Ownership can be taken in the advanced security settings. |
| Path | The chain of key names from a main key down to a key, separated by backslashes, for example HKEY_CURRENT_USER\Software. |
| Permissions | The rules that define which users and groups may read or modify a key. |
QWORD (REG_QWORD) | A 64-bit number for large numeric values. |
| Regular expression (RegEx) | A search pattern in ECMAScript syntax, for example \.exe$. Enabled with the Regular expression (RegEx) option in the Find pane. |
| Result list | The list that collects all matches of a search, with key path, value name, type and data. |
| Root key | See hive. |
String (REG_SZ) | A single string of text, used for paths, names and simple text settings. |
| Subkey | A key below another key. |
| Value | A named entry inside a key that stores data of a specific type – text, a number or binary content. |
| Value list | The list on the right of the main window that shows the values of the selected key with name, type and data. |
| Value type | The data type of a value, for example REG_SZ or REG_DWORD. It determines which editor opens and how the data is interpreted. See Value types. |
| Windows PE | The Windows Preinstallation Environment, in which O&O RegEditor also runs, for example as part of O&O BlueCon. Settings are then kept in memory only. |