diff --git a/modules/rostests/apitests/comctl32/propsheet.c b/modules/rostests/apitests/comctl32/propsheet.c
index 9daf5b0a401..e4d7be568b4 100644
--- a/modules/rostests/apitests/comctl32/propsheet.c
+++ b/modules/rostests/apitests/comctl32/propsheet.c
@@ -1,9 +1,10 @@
 /*
  * PROJECT:     ReactOS api tests
  * LICENSE:     GPL-2.0+ (https://spdx.org/licenses/GPL-2.0+)
- * PURPOSE:     Test for property sheet
+ * PURPOSE:     Test for v6 property sheet
  * COPYRIGHT:   Copyright 2019 Katayama Hirofumi MZ (katayama.hirofumi.mz@gmail.com)
  */
+
 #include "wine/test.h"
 #include <windows.h>
 #include <windowsx.h>
@@ -73,17 +74,82 @@ Page1DlgProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
     return 0;
 }
 
+#ifdef _MSC_VER
+#define CHECK_STRUCT_SIZE(x, y) C_ASSERT((x) == (y))
+#else
+// Can't do this compile time, thanks gcc
+// 'error: non-nested function with variably modified type'
+#define CHECK_STRUCT_SIZE(x, y) ok((x) == (y), "Wrong size for %s, got %u, expected %u\n", #x, y, x)
+#endif
+
+// Validate struct sizes
+static void test_StructSizes()
+{
+#ifdef _M_X64
+    CHECK_STRUCT_SIZE(PROPSHEETPAGEA_V1_SIZE, 72);
+    CHECK_STRUCT_SIZE(PROPSHEETPAGEA_V2_SIZE, 88);
+    CHECK_STRUCT_SIZE(PROPSHEETPAGEA_V3_SIZE, 96);
+    CHECK_STRUCT_SIZE(PROPSHEETPAGEA_V4_SIZE, 104);
+    CHECK_STRUCT_SIZE(PROPSHEETHEADERA_V1_SIZE, 72);
+    CHECK_STRUCT_SIZE(PROPSHEETHEADERA_V2_SIZE, 96);
+
+    CHECK_STRUCT_SIZE(PROPSHEETPAGEW_V1_SIZE, 72);
+    CHECK_STRUCT_SIZE(PROPSHEETPAGEW_V2_SIZE, 88);
+    CHECK_STRUCT_SIZE(PROPSHEETPAGEW_V3_SIZE, 96);
+    CHECK_STRUCT_SIZE(PROPSHEETPAGEW_V4_SIZE, 104);
+    CHECK_STRUCT_SIZE(PROPSHEETHEADERW_V1_SIZE, 72);
+    CHECK_STRUCT_SIZE(PROPSHEETHEADERW_V2_SIZE, 96);
+#else
+    CHECK_STRUCT_SIZE(PROPSHEETPAGEA_V1_SIZE, 40);
+    CHECK_STRUCT_SIZE(PROPSHEETPAGEA_V2_SIZE, 48);
+    CHECK_STRUCT_SIZE(PROPSHEETPAGEA_V3_SIZE, 52);
+    CHECK_STRUCT_SIZE(PROPSHEETPAGEA_V4_SIZE, 56);
+    CHECK_STRUCT_SIZE(PROPSHEETHEADERA_V1_SIZE, 40);
+    CHECK_STRUCT_SIZE(PROPSHEETHEADERA_V2_SIZE, 52);
+
+    CHECK_STRUCT_SIZE(PROPSHEETPAGEW_V1_SIZE, 40);
+    CHECK_STRUCT_SIZE(PROPSHEETPAGEW_V2_SIZE, 48);
+    CHECK_STRUCT_SIZE(PROPSHEETPAGEW_V3_SIZE, 52);
+    CHECK_STRUCT_SIZE(PROPSHEETPAGEW_V4_SIZE, 56);
+    CHECK_STRUCT_SIZE(PROPSHEETHEADERW_V1_SIZE, 40);
+    CHECK_STRUCT_SIZE(PROPSHEETHEADERW_V2_SIZE, 52);
+#endif
+}
+
 typedef HPROPSHEETPAGE (WINAPI *FN_CreatePropertySheetPageW)(LPCPROPSHEETPAGEW);
 typedef int (WINAPI *FN_PropertySheetW)(LPCPROPSHEETHEADERW);
+static FN_CreatePropertySheetPageW pCreatePropertySheetPageW;
+static FN_PropertySheetW pPropertySheetW;
+
+// Show that the Apply button is not enabled by default
+static void test_ApplyButtonDisabled()
+{
+    PROPSHEETPAGEW psp = {0};
+    PROPSHEETHEADERW header = {0};
+    HPROPSHEETPAGE hpsp[1];
+
+    psp.dwSize = sizeof(psp);
+    psp.dwFlags = PSP_DEFAULT;
+    psp.hInstance = GetModuleHandleW(NULL);
+    psp.pszTemplate = MAKEINTRESOURCEW(1);
+    psp.pfnDlgProc = Page1DlgProc;
+    hpsp[0] = pCreatePropertySheetPageW(&psp);
+    ok(hpsp[0] != NULL, "hpsp[0] was NULL.\n");
+
+    header.dwSize = sizeof(header);
+    header.dwFlags = 0;
+    header.hInstance = GetModuleHandleW(NULL);
+    header.hwndParent = NULL;
+    header.nPages = ARRAYSIZE(hpsp);
+    header.phpage = hpsp;
+    header.pszCaption = L"propsheet";
+    ok(pPropertySheetW(&header) > 0, "PropertySheet returned non-positive value.\n");
+}
+
 
 START_TEST(propsheet)
 {
-    PROPSHEETPAGEW psp;
-    PROPSHEETHEADERW header;
-    HPROPSHEETPAGE hpsp[1];
     HMODULE hComCtl32;
-    FN_CreatePropertySheetPageW pCreatePropertySheetPageW;
-    FN_PropertySheetW pPropertySheetW;
 
     hComCtl32 = LoadLibraryW(L"comctl32.dll");
     pCreatePropertySheetPageW = (FN_CreatePropertySheetPageW)GetProcAddress(hComCtl32, "CreatePropertySheetPageW");
@@ -98,24 +164,8 @@ START_TEST(propsheet)
         return;
     }
 
-    ZeroMemory(&psp, sizeof(psp));
-    psp.dwSize = sizeof(psp);
-    psp.dwFlags = PSP_DEFAULT;
-    psp.hInstance = GetModuleHandleW(NULL);
-    psp.pszTemplate = MAKEINTRESOURCEW(1);
-    psp.pfnDlgProc = Page1DlgProc;
-    hpsp[0] = (*pCreatePropertySheetPageW)(&psp);
-    ok(hpsp[0] != NULL, "hpsp[0] was NULL.\n");
-
-    ZeroMemory(&header, sizeof(header));
-    header.dwSize = sizeof(header);
-    header.dwFlags = 0;
-    header.hInstance = GetModuleHandleW(NULL);
-    header.hwndParent = NULL;
-    header.nPages = ARRAYSIZE(hpsp);
-    header.phpage = hpsp;
-    header.pszCaption = L"propsheet";
-    ok((*pPropertySheetW)(&header) > 0, "PropertySheet returned non-positive value.\n");
+    test_StructSizes();
+    test_ApplyButtonDisabled();
 
     FreeLibrary(hComCtl32);
 }
diff --git a/sdk/include/psdk/prsht.h b/sdk/include/psdk/prsht.h
index 0356c7e247e..a35537ebe4c 100644
--- a/sdk/include/psdk/prsht.h
+++ b/sdk/include/psdk/prsht.h
@@ -194,6 +194,15 @@ typedef struct _PROPSHEETPAGEA {
 	LPCSTR pszHeaderTitle;
 	LPCSTR pszHeaderSubTitle;
 #endif
+#if (_WIN32_IE >= 0x0501)
+    HANDLE hActCtx;
+#endif
+#if (_WIN32_IE >= 0x0600)
+    _ANONYMOUS_UNION union {
+        HBITMAP hbmHeader;
+        LPCSTR pszbmHeader;
+    } DUMMYUNIONNAME3;
+#endif
 } PROPSHEETPAGEA,*LPPROPSHEETPAGEA,
   PROPSHEETPAGEA_LATEST, *LPPROPSHEETPAGEA_LATEST;
 typedef const PROPSHEETPAGEA *LPCPROPSHEETPAGEA, *LPCPROPSHEETPAGEA_LATEST;
@@ -222,6 +231,15 @@ typedef struct _PROPSHEETPAGEW {
 	LPCWSTR pszHeaderTitle;
 	LPCWSTR pszHeaderSubTitle;
 #endif
+#if (_WIN32_IE >= 0x0501)
+    HANDLE hActCtx;
+#endif
+#if (_WIN32_IE >= 0x0600)
+    _ANONYMOUS_UNION union {
+        HBITMAP hbmHeader;
+        LPCWSTR pszbmHeader;
+    } DUMMYUNIONNAME3;
+#endif
 } PROPSHEETPAGEW,*LPPROPSHEETPAGEW,
   PROPSHEETPAGEW_LATEST, *LPPROPSHEETPAGEW_LATEST;
 typedef const PROPSHEETPAGEW *LPCPROPSHEETPAGEW, *LPCPROPSHEETPAGEW_LATEST;