Create win10-taskbar-on-win11.wh.cpp (#847)

Restores Win10 taskbar on Win11

mods/win10-taskbar-on-win11.wh.cpp

@@ -0,0 +1,57 @@
+// ==WindhawkMod==
+// @id           win10-taskbar-on-win11
+// @name         Windows 10 taskbar on Windows 11
+// @description  Enables Windows 10 taskbar on Windows 11 versions 21H2 to 23H2 via registry
+// @version      1.0
+// @author       Anixx
+// @github       https://github.com/Anixx
+// @include      explorer.exe
+// ==/WindhawkMod==
+
+// ==WindhawkModReadme==
+/*
+This mod enables Windows 10 taskbar on Windows 11 versions 21H2 to 23H2 via registry method, without
+using Explorer Patcher. 
+
+It may be useful also on later versions of Windows with Explorer.exe downgraded to previous versions
+and/or manipulated Windows features using vivetool utility.
+
+If you want to get rid of the cogwheel icon in the tray area, use the mod "Hide Action Center icon".
+You can restore the clock and set up the tray icons using legacy tray setup dialog,
+which you can start with command `shell:::{05d7b0f4-2121-4eff-bf6b-ed3f69b894d9}`
+*/
+// ==/WindhawkModReadme==
+
+#include <windows.h>
+
+typedef LONG (WINAPI *REGQUERYVALUEEXW)(HKEY hKey, LPCWSTR lpValueName, LPDWORD lpReserved, LPDWORD lpType, LPBYTE lpData, LPDWORD lpcbData);
+
+REGQUERYVALUEEXW pOriginalRegQueryValueExW;
+
+LONG WINAPI RegQueryValueExWHook(HKEY hKey, LPCWSTR lpValueName, LPDWORD lpReserved, LPDWORD lpType, LPBYTE lpData, LPDWORD lpcbData)
+{   
+
+    if (lstrcmpiW(lpValueName, L"UndockingDisabled") == 0)
+
+    { 
+            if (lpType)
+                *lpType = REG_DWORD;
+            if (lpData && lpcbData && *lpcbData >= sizeof(DWORD))
+            {
+                *(DWORD*)lpData = 1;
+                *lpcbData = sizeof(DWORD);
+            }
+            return ERROR_SUCCESS;
+    }
+
+    return pOriginalRegQueryValueExW(hKey, lpValueName, lpReserved, lpType, lpData, lpcbData);
+}
+
+BOOL Wh_ModInit(void)
+{
+    Wh_Log(L"Init");
+
+    Wh_SetFunctionHook((void*)GetProcAddress(LoadLibrary(L"kernelbase.dll"), "RegQueryValueExW"), (void*)RegQueryValueExWHook, (void**)&pOriginalRegQueryValueExW);
+
+    return TRUE;
+}