How Can a 32-bit Application Access the 64-bit Windows Registry?
Jan 16, 2025 pm 07:12 PMRead 64-bit registry from 32-bit application
When a 32-bit application is running on a 64-bit Windows system, it can only access the registry key under HKEY_LOCAL_MACHINESoftwareWow6432Node. However, in some cases, access to the 64-bit registry is required.
Solution:
Using .NET Framework 4.x and above:
.NET Framework 4.x and later provides the RegistryView enumeration, allowing direct access to 64-bit and 32-bit registry keys. Here’s how to do it:
Access 64-bit registry:
using Microsoft.Win32; RegistryKey localKey = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry64); // 對(duì)64位注冊(cè)表執(zhí)行操作
Access 32-bit registry:
RegistryKey localKey = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry32); // 對(duì)32位注冊(cè)表執(zhí)行操作
Alternative:
For situations where you need to access both 64-bit and 32-bit registry keys, you can use the following method:
// 獲取64位和32位節(jié)點(diǎn)的所有注冊(cè)表值 var mergedValues = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry64).GetValues() .Concat(RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry32).GetValues()); // 獲取64位和32位節(jié)點(diǎn)的所有注冊(cè)表項(xiàng) var mergedKeys = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry64).GetSubKeyNames() .Concat(RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry32).GetSubKeyNames());
Note:
- Reading the 64-bit registry is possible thanks to Windows' WOW64 subsystem (which emulates 32-bit operations on 64-bit systems).
- In Windows 7, there is a bug where the 32-bit code version always returns "Microsoft" for RegisteredOrganization regardless of the actual value.
- In 32-bit versions of Windows, the WOW6432Node subtree does not exist.
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