Reading 64Bit Registry from a 32Bit Application

Reading 64bit Registry from a 32bit application

you have to use the KEY_WOW64_64KEY param when creating/opening the registry key. But AFAIK that's not possible with the Registry class but only when using the API directly.

This might help to get you started.

Reading registry in both 64 and 32 bit windows

Windows 64 bit system divide registry into two part. One for 32 and another for 64 bit system.
I believe you should update your call to following:

RegOpenKeyEx(HKEY_LOCAL_MACHINE, Path, 0, KEY_ALL_ACCESS | KEY_WOW64_32KEY, &hKey)

Accessing 64-bit Registry in 32-bit application

I solved this now - thanks goes to Petrucio who posted this solution in 2012: read/write to Windows Registry using Java.

E.g. - Read Operation:

try { 
  String value = WinRegistry.readString(WinRegistry.HKEY_LOCAL_MACHINE, "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run", "TestValue", WinRegistry.KEY_WOW64_64KEY);
  System.out.println(value);
} catch (Exception ex) {
  ex.printStackTrace(); 
}

I hope that is usefully for someone.

Modifying 64-bit registries using 32-bit application or vice versa

You need to use RegistryKey.OpenBaseKey() to create a RegistryKey object for the desired view (32bit or 64bit) of the Registry.

RegistryKey ^key = RegistryKey::OpenBaseKey(RegistryHive::LocalMachine, RegistryView::Registry32);
// the next call maps to "SOFTWARE\\WOW6432Node\\Apple Computer" on a 64bit system...
if (key->OpenSubKey("SOFTWARE\\Apple Computer, Inc."))
{
    key->DeleteSubKeyTree("QuickTime");
    key->Close();
}

string path = "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall";
RegistryKey^ key;

key = RegistryKey::OpenBaseKey(RegistryHive::LocalMachine, RegistryView::Registry32);
key->DeleteSubKeyTree(path);

key = RegistryKey::OpenBaseKey(RegistryHive::LocalMachine, RegistryView::Registry64);
key->DeleteSubKeyTree(path);

Read 64bit registry from 32bit app, in VB.NET

Dim TS__x64 As Microsoft.Win32.RegistryKey = Microsoft.Win32.RegistryKey.OpenBaseKey _
                                            (Microsoft.Win32.RegistryHive.LocalMachine, Microsoft.Win32.RegistryView.Registry64)
    Dim CALE_TS__x64 As String = TS__x64.OpenSubKey("SOFTWARE\TeamSpeak 3 Client").GetValue(Nothing)

    Dim TS__x32 As Microsoft.Win32.RegistryKey = Microsoft.Win32.RegistryKey.OpenBaseKey _
                                    (Microsoft.Win32.RegistryHive.LocalMachine, Microsoft.Win32.RegistryView.Registry32)
    Dim CALE_TS__x32 As String = TS__x32.OpenSubKey("SOFTWARE\Wow6432Node\TeamSpeak 3 Client").GetValue(Nothing)


    TextBox1.Text = CALE_TS__x64
    TextBox2.Text = CALE_TS__x32

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