| ERROR_SUCCESS | Completed successfully. |
| ERROR_CANNOT_OPEN_REGFILE | Cannot find the required registry hive file or possibly the file is kept open by another application. |
| ERROR_INSUFFICIENT_MEMORY | Not enough memory to open this registry key or not enough memory to load the required data from the registry file, or the given buffer is not enough to hold the data. |
| ERROR_INVALID_PARAMETER | lpszDevName is an invalid address, or dwFlags is incorrect. |
| ERROR_REGFILE_READERROR | Error reading the registry file. Possibly, the file is corrupt. |
| ERROR_REGFILE_WRITEERROR | Error writing the registry file. Possibly, the file is corrupt. |
| ERROR_REGKEY_INVALIDKEY | The lpszSubKey string contains an invalid character or the given hKey is invalid. |
| ERROR_FILE_NOT_FOUND | No more subkeys, or the key specified is not found in the registry database. |
| ERROR_VALUE_NOT_FOUND | No more values to enumerate, or the given value name is not present for the given registry key. |