diff --git a/sdk/xtdk/pstypes.h b/sdk/xtdk/pstypes.h
index 2be3001..2562ce6 100644
--- a/sdk/xtdk/pstypes.h
+++ b/sdk/xtdk/pstypes.h
@@ -12,6 +12,7 @@
 #include <xttypes.h>
 #include <xtstruct.h>
 #include <extypes.h>
+#include <iotypes.h>
 #include <mmtypes.h>
 #include <setypes.h>
 
@@ -195,12 +196,12 @@ typedef struct _PEB
     ULONG TlsBitmapBits[2];
     PVOID ReadOnlySharedMemoryBase;
     PVOID HotpatchInformation;
-    PVOID* ReadOnlyStaticServerData;
+    PVOID *ReadOnlyStaticServerData;
     PVOID AnsiCodePageData;
     PVOID OemCodePageData;
     PVOID UnicodeCaseTableData;
     ULONG NumberOfProcessors;
-    ULONG NtGlobalFlag;
+    ULONG GlobalFlag;
     LARGE_INTEGER CriticalSectionTimeout;
     ULONG_PTR HeapSegmentReserve;
     ULONG_PTR HeapSegmentCommit;
@@ -208,15 +209,8 @@ typedef struct _PEB
     ULONG_PTR HeapDeCommitFreeBlockThreshold;
     ULONG NumberOfHeaps;
     ULONG MaximumNumberOfHeaps;
-    PVOID* ProcessHeaps;
-    PVOID GdiSharedHandleTable;
+    PVOID *ProcessHeaps;
     PVOID ProcessStarterHelper;
-    ULONG GdiDCAttributeList;
-    ULONG OSMajorVersion;
-    ULONG OSMinorVersion;
-    USHORT OSBuildNumber;
-    USHORT OSCSDVersion;
-    ULONG OSPlatformId;
     ULONG ImageSubsystem;
     ULONG ImageSubsystemMajorVersion;
     ULONG ImageSubsystemMinorVersion;
@@ -230,7 +224,7 @@ typedef struct _PEB
     PVOID AppCompatInfo;
     UNICODE_STRING CSDVersion;
     ULONG_PTR MinimumStackCommit;
-    PVOID* FlsCallback;
+    PVOID *FlsCallback;
     LIST_ENTRY FlsListHead;
     PVOID FlsBitmap;
     ULONG FlsBitmapBits[4];
@@ -244,5 +238,75 @@ typedef struct _PEB_FREE_BLOCK
     ULONG Size;
 } PEB_FREE_BLOCK, *PPEB_FREE_BLOCK;
 
+/* Kernel's representation of a thread environment block */
+typedef struct _TEB
+{
+    THREAD_INFORMATION_BLOCK ThreadInformationBlock;
+    PVOID EnvironmentPointer;
+    CLIENT_ID ClientId;
+    PVOID ActiveRpcHandle;
+    PVOID ThreadLocalStoragePointer;
+    PPEB ProcessEnvironmentBlock;
+    ULONG LastErrorValue;
+    ULONG CountOfOwnedCriticalSections;
+    ULONG UserReserved[5];
+    LCID CurrentLocale;
+    ULONG FpSoftwareStatusRegister;
+    PVOID SystemReserved1[54];
+    LONG ExceptionCode;
+    PACTIVATION_CONTEXT_STACK ActivationContextStackPointer;
+    CLIENT_ID RealClientId;
+    ULONG LastStatusValue;
+    UNICODE_STRING StaticUnicodeString;
+    WCHAR StaticUnicodeBuffer[261];
+    PVOID DeallocationStack;
+    PVOID TlsSlots[64];
+    LIST_ENTRY TlsLinks;
+    PVOID ReservedForNtRpc;
+    PVOID DbgSsReserved[2];
+    ULONG HardErrorMode;
+    PVOID Instrumentation[14];
+    PVOID SubProcessTag;
+    PVOID EtwTraceData;
+    PVOID WinSockData;
+    BOOLEAN InDbgPrint;
+    BOOLEAN FreeStackOnTermination;
+    BOOLEAN HasFiberData;
+    UCHAR IdealProcessor;
+    ULONG GuaranteedStackBytes;
+    PVOID ReservedForPerf;
+    PVOID ReservedForOle;
+    ULONG WaitingOnLoaderLock;
+    ULONG_PTR SparePointer1;
+    ULONG_PTR SoftPatchPtr1;
+    ULONG_PTR SoftPatchPtr2;
+    PVOID *TlsExpansionSlots;
+    ULONG ImpersonationLocale;
+    ULONG IsImpersonating;
+    PVOID NlsCache;
+    PVOID ShimData;
+    ULONG HeapVirtualAffinity;
+    HANDLE CurrentTransactionHandle;
+    PTEB_ACTIVE_FRAME ActiveFrame;
+    PVOID FlsData;
+    BOOLEAN SafeThunkCall;
+    BOOLEAN BooleanSpare[3];
+} TEB, *PTEB;
+
+/* Thread Environment Block Active Frame structure definition */
+typedef struct _TEB_ACTIVE_FRAME
+{
+    ULONG Flags;
+    PTEB_ACTIVE_FRAME Previous;
+    PTEB_ACTIVE_FRAME_CONTEXT Context;
+} TEB_ACTIVE_FRAME, *PTEB_ACTIVE_FRAME;
+
+/* Thread Environment Block Active Frame Context structure definition */
+typedef struct _TEB_ACTIVE_FRAME_CONTEXT
+{
+    ULONG Flags;
+    LPSTR FrameName;
+} TEB_ACTIVE_FRAME_CONTEXT, *PTEB_ACTIVE_FRAME_CONTEXT;
+
 #endif /* __XTOS_ASSEMBLER__ */
 #endif /* __XTDK_PSTYPES_H */
diff --git a/sdk/xtdk/rtltypes.h b/sdk/xtdk/rtltypes.h
index 3311b66..c2ba09e 100644
--- a/sdk/xtdk/rtltypes.h
+++ b/sdk/xtdk/rtltypes.h
@@ -182,6 +182,24 @@ typedef enum _RTL_VARIABLE_TYPE
     TypeWideString
 } RTL_VARIABLE_TYPE, *PRTL_VARIABLE_TYPE;
 
+/* Activation context stack structure definition */
+typedef struct _ACTIVATION_CONTEXT_STACK
+{
+    PRTL_ACTIVATION_CONTEXT_STACK_FRAME ActiveFrame;
+    LIST_ENTRY FrameListCache;
+    ULONG Flags;
+    ULONG NextCookieSequenceNumber;
+    ULONG StackId;
+} ACTIVATION_CONTEXT_STACK, *PACTIVATION_CONTEXT_STACK;
+
+/* Activation context stack frame structure definition */
+typedef struct _RTL_ACTIVATION_CONTEXT_STACK_FRAME
+{
+    PRTL_ACTIVATION_CONTEXT_STACK_FRAME Previous;
+    PVOID ActivationContext;
+    ULONG Flags;
+} RTL_ACTIVATION_CONTEXT_STACK_FRAME, *PRTL_ACTIVATION_CONTEXT_STACK_FRAME;
+
 /* Runtime Library red-black tree balanced node structure definition */
 typedef struct _RTL_BALANCED_NODE
 {
diff --git a/sdk/xtdk/xtstruct.h b/sdk/xtdk/xtstruct.h
index cd35639..ea4a468 100644
--- a/sdk/xtdk/xtstruct.h
+++ b/sdk/xtdk/xtstruct.h
@@ -105,6 +105,7 @@ typedef struct _ACPI_SUBTABLE_HEADER ACPI_SUBTABLE_HEADER, *PACPI_SUBTABLE_HEADE
 typedef struct _ACPI_SYSTEM_INFO ACPI_SYSTEM_INFO, *PACPI_SYSTEM_INFO;
 typedef struct _ACPI_TIMER_INFO ACPI_TIMER_INFO, *PACPI_TIMER_INFO;
 typedef struct _ACPI_XSDT ACPI_XSDT, *PACPI_XSDT;
+typedef struct _ACTIVATION_CONTEXT_STACK ACTIVATION_CONTEXT_STACK, *PACTIVATION_CONTEXT_STACK;
 typedef struct _ANSI_STRING ANSI_STRING, *PANSI_STRING;
 typedef struct _ANSI_STRING32 ANSI_STRING32, *PANSI_STRING32;
 typedef struct _ANSI_STRING64 ANSI_STRING64, *PANSI_STRING64;
@@ -440,6 +441,7 @@ typedef struct _PRIVILEGE_SET PRIVILEGE_SET, *PPRIVILEGE_SET;
 typedef struct _PROCESSOR_IDENTITY PROCESSOR_IDENTITY, *PPROCESSOR_IDENTITY;
 typedef struct _PROCESSOR_POWER_STATE PROCESSOR_POWER_STATE, *PPROCESSOR_POWER_STATE;
 typedef struct _QUAD QUAD, *PQUAD;
+typedef struct _RTL_ACTIVATION_CONTEXT_STACK_FRAME RTL_ACTIVATION_CONTEXT_STACK_FRAME, *PRTL_ACTIVATION_CONTEXT_STACK_FRAME;
 typedef struct _RTL_BALANCED_NODE RTL_BALANCED_NODE, *PRTL_BALANCED_NODE;
 typedef struct _RTL_BITMAP RTL_BITMAP, *PRTL_BITMAP;
 typedef struct _RTL_PRINT_CONTEXT RTL_PRINT_CONTEXT, *PRTL_PRINT_CONTEXT;
@@ -460,6 +462,9 @@ typedef struct _STRING STRING, *PSTRING;
 typedef struct _STRING32 STRING32, *PSTRING32;
 typedef struct _STRING64 STRING64, *PSTRING64;
 typedef struct _SYSTEM_POWER_STATE_CONTEXT SYSTEM_POWER_STATE_CONTEXT, *PSYSTEM_POWER_STATE_CONTEXT;
+typedef struct _TEB TEB, *PTEB;
+typedef struct _TEB_ACTIVE_FRAME TEB_ACTIVE_FRAME, *PTEB_ACTIVE_FRAME;
+typedef struct _TEB_ACTIVE_FRAME_CONTEXT TEB_ACTIVE_FRAME_CONTEXT, *PTEB_ACTIVE_FRAME_CONTEXT;
 typedef struct _THREAD_INFORMATION_BLOCK THREAD_INFORMATION_BLOCK, *PTHREAD_INFORMATION_BLOCK;
 typedef struct _TIME_FIELDS TIME_FIELDS, *PTIME_FIELDS;
 typedef struct _TIMER_ROUTINES TIMER_ROUTINES, *PTIMER_ROUTINES;