Test

shared/LegacyUpdate.c

@@ -0,0 +1,31 @@
+#include "stdafx.h"
+#include <windows.h>
+#include "Registry.h"
+
+static LPWSTR _installPath;
+
+EXTERN_C HRESULT GetInstallPath(LPWSTR *path) {
+	*path = (LPWSTR)LocalAlloc(LPTR, MAX_PATH * sizeof(WCHAR));
+	HRESULT hr = S_OK;
+
+	if (!_installPath) {
+		DWORD size = 0;
+		hr = GetRegistryString(HKEY_LOCAL_MACHINE, L"Software\\Microsoft\\Windows\\CurrentVersion\\Uninstall\\LegacyUpdate", L"InstallLocation", KEY_WOW64_64KEY, &_installPath, &size);
+		if (SUCCEEDED(hr)) {
+			lstrcpy(*path, _installPath);
+			return S_OK;
+		}
+
+		// Do our best to guess where it should be
+		LPWSTR programFiles;
+		hr = GetRegistryString(HKEY_LOCAL_MACHINE, L"Software\\Microsoft\\Windows\\CurrentVersion", L"ProgramFilesDir", KEY_WOW64_64KEY, &programFiles, &size);
+		if (SUCCEEDED(hr)) {
+			_installPath = (LPWSTR)LocalAlloc(LPTR, MAX_PATH * sizeof(WCHAR));
+			wsprintf(_installPath, L"%ls\\Legacy Update", programFiles);
+			LocalFree(programFiles);
+		}
+	}
+
+	lstrcpy(*path, _installPath);
+	return hr;
+}