diff --git a/Contrib/InstallOptions/InstallerOptions.cpp b/Contrib/InstallOptions/InstallerOptions.cpp
index 247fe07e..200e9c09 100644
--- a/Contrib/InstallOptions/InstallerOptions.cpp
+++ b/Contrib/InstallOptions/InstallerOptions.cpp
@@ -18,6 +18,17 @@
 
 #include <nsis/pluginapi.h> // nsis plugin
 
+#ifndef _countof
+#ifndef __cplusplus
+#define _countof(_Array) (sizeof(_Array) / sizeof(_Array[0]))
+#else
+  extern "C++" {
+    template <typename _CountofType,size_t _SizeOfArray> char (*__countof_helper(UNALIGNED _CountofType (&_Array)[_SizeOfArray]))[_SizeOfArray];
+#define _countof(_Array) sizeof(*__countof_helper(_Array))
+  }
+#endif
+#endif
+
 // Use for functions only called from one place to possibly reduce some code
 // size.  Allows the source code to remain readable by leaving the function
 // intact.
diff --git a/Contrib/Library/LibraryLocal/LibraryLocal.cpp b/Contrib/Library/LibraryLocal/LibraryLocal.cpp
index 67b98466..6beb9218 100644
--- a/Contrib/Library/LibraryLocal/LibraryLocal.cpp
+++ b/Contrib/Library/LibraryLocal/LibraryLocal.cpp
@@ -27,6 +27,17 @@ int GetTLBVersion(tstring& filepath, DWORD& high, DWORD & low)
 {
 #ifdef _WIN32
 
+#ifndef _countof
+#ifndef __cplusplus
+#define _countof(_Array) (sizeof(_Array) / sizeof(_Array[0]))
+#else
+  extern "C++" {
+    template <typename _CountofType,size_t _SizeOfArray> char (*__countof_helper(UNALIGNED _CountofType (&_Array)[_SizeOfArray]))[_SizeOfArray];
+#define _countof(_Array) sizeof(*__countof_helper(_Array))
+  }
+#endif
+#endif
+
   int found = 0;
 
   TCHAR fullpath[1024];
diff --git a/Contrib/Library/RegTool/RegTool.c b/Contrib/Library/RegTool/RegTool.c
index 72cb983e..f8760489 100644
--- a/Contrib/Library/RegTool/RegTool.c
+++ b/Contrib/Library/RegTool/RegTool.c
@@ -1,5 +1,10 @@
 #include <windows.h>
-#include "../../ExDll/nsis_tchar.h"
+#include <tchar.h>
+
+#ifndef _CRT_STRINGIZE
+#define __CRT_STRINGIZE(_Value) #_Value
+#define _CRT_STRINGIZE(_Value) __CRT_STRINGIZE(_Value)
+#endif /* _CRT_STRINGIZE */
 
 #define STR_SIZE 1024
 
diff --git a/Contrib/Makensisw/utils.cpp b/Contrib/Makensisw/utils.cpp
index 9a76d977..2aef1153 100644
--- a/Contrib/Makensisw/utils.cpp
+++ b/Contrib/Makensisw/utils.cpp
@@ -27,6 +27,17 @@
 #include "toolbar.h"
 #include "noclib.h"
 
+#ifndef _countof
+#ifndef __cplusplus
+#define _countof(_Array) (sizeof(_Array) / sizeof(_Array[0]))
+#else
+  extern "C++" {
+    template <typename _CountofType,size_t _SizeOfArray> char (*__countof_helper(UNALIGNED _CountofType (&_Array)[_SizeOfArray]))[_SizeOfArray];
+#define _countof(_Array) sizeof(*__countof_helper(_Array))
+  }
+#endif
+#endif
+
 NTOOLTIP g_tip;
 LRESULT CALLBACK TipHookProc(int nCode, WPARAM wParam, LPARAM lParam);
 
diff --git a/Contrib/nsDialogs/browse.c b/Contrib/nsDialogs/browse.c
index 6c823491..33212908 100644
--- a/Contrib/nsDialogs/browse.c
+++ b/Contrib/nsDialogs/browse.c
@@ -8,6 +8,17 @@
 
 #include "defs.h"
 
+#ifndef _countof
+#ifndef __cplusplus
+#define _countof(_Array) (sizeof(_Array) / sizeof(_Array[0]))
+#else
+  extern "C++" {
+    template <typename _CountofType,size_t _SizeOfArray> char (*__countof_helper(UNALIGNED _CountofType (&_Array)[_SizeOfArray]))[_SizeOfArray];
+#define _countof(_Array) sizeof(*__countof_helper(_Array))
+  }
+#endif
+#endif
+
 int CALLBACK BrowseCallbackProc(HWND hwnd, UINT uMsg, LPARAM lp, LPARAM pData) {
   if (uMsg == BFFM_INITIALIZED)
     SendMessage(hwnd, BFFM_SETSELECTION, TRUE, pData);
diff --git a/Contrib/zip2exe/main.cpp b/Contrib/zip2exe/main.cpp
index c85e8a7b..db5123bc 100644
--- a/Contrib/zip2exe/main.cpp
+++ b/Contrib/zip2exe/main.cpp
@@ -1,8 +1,19 @@
 #include <windows.h>
+#include <tchar.h>
 #include <stdio.h>
 #include <ctype.h>
 #include <commctrl.h>
-#include "..\ExDLL\nsis_tchar.h"
+
+#ifndef _countof
+#ifndef __cplusplus
+#define _countof(_Array) (sizeof(_Array) / sizeof(_Array[0]))
+#else
+  extern "C++" {
+    template <typename _CountofType,size_t _SizeOfArray> char (*__countof_helper(UNALIGNED _CountofType (&_Array)[_SizeOfArray]))[_SizeOfArray];
+#define _countof(_Array) sizeof(*__countof_helper(_Array))
+  }
+#endif
+#endif
 
 /*
 version 0.36
diff --git a/SCons/Config/gnu b/SCons/Config/gnu
index 64983c4d..40009131 100644
--- a/SCons/Config/gnu
+++ b/SCons/Config/gnu
@@ -95,8 +95,6 @@ makensis_env.Append(CXXFLAGS = ['-Wno-non-virtual-dtor']) # ignore virtual dtor
 makensis_env.Append(CXXFLAGS = ['-Wall'])                 # all warnings
 
 conf = FlagsConfigure(makensis_env)
-conf.CheckCompileFlag('-m32')                     #
-conf.CheckLinkFlag('-m32')                        #
 conf.CheckLinkFlag('$MAP_FLAG')                   # generate map file
 if not defenv['DEBUG'] and defenv['STRIP'] and defenv['STRIP_CP']:
 	TestStrip(conf)                                 # strip
@@ -150,8 +148,6 @@ conf.Finish()
 ### cross-platform util environment adjustments
 
 conf = FlagsConfigure(cp_util_env)
-conf.CheckCompileFlag('-m32')
-conf.CheckLinkFlag('-m32')
 if not defenv['DEBUG'] and defenv['STRIP'] and defenv['STRIP_CP']:
 	TestStrip(conf)                                 # strip
 conf.Finish()
@@ -161,8 +157,6 @@ conf.Finish()
 test_env = defenv.Clone()
 test_env.Append(CPPPATH = ['#$BUILD_CONFIG'])
 conf = FlagsConfigure(test_env)
-conf.CheckCompileFlag('-m32')
-conf.CheckLinkFlag('-m32')
 conf.Finish()
 
 ### weird GCC requirements
diff --git a/SConstruct b/SConstruct
index f8dc3428..d63d1579 100644
--- a/SConstruct
+++ b/SConstruct
@@ -223,7 +223,6 @@ defines_h.close()
 # write version into version.h
 f = open(defenv.File('#$BUILD_CONFIG/nsis-version.h').abspath, 'w')
 f.write('// This file is automatically generated by SCons\n// DO NOT EDIT THIS FILE\n')
-f.write('#include "tchar.h"\n')
 
 if defenv.has_key('VER_MAJOR'):
 	defenv['VERSION'] = defenv['VER_MAJOR']
diff --git a/Source/DialogTemplate.cpp b/Source/DialogTemplate.cpp
index e0d336fc..56f7c9b2 100644
--- a/Source/DialogTemplate.cpp
+++ b/Source/DialogTemplate.cpp
@@ -74,7 +74,7 @@ void ReadVarLenArr(LPBYTE &seeker, WCHAR* &readInto, unsigned int uCodePage) {
     if (IS_INTRESOURCE(x)) { \
       *(WORD*)seeker = 0xFFFF; \
       seeker += sizeof(WORD); \
-      *(WORD*)seeker = ConvertEndianness(WORD(DWORD(x))); \
+      *(WORD*)seeker = ConvertEndianness(WORD((ULONG_PTR)(x))); \
       seeker += sizeof(WORD); \
     } \
     else { \
@@ -444,7 +444,7 @@ void CDialogTemplate::ConvertToRTL() {
       szClass = winchar_toansi(m_vItems[i]->szClass);
 
     // Button
-    if (long(m_vItems[i]->szClass) == 0x80) {
+    if ((ULONG_PTR)(m_vItems[i]->szClass) == 0x80) {
       m_vItems[i]->dwStyle ^= BS_LEFTTEXT;
       m_vItems[i]->dwStyle ^= BS_RIGHT;
       m_vItems[i]->dwStyle ^= BS_LEFT;
@@ -458,13 +458,13 @@ void CDialogTemplate::ConvertToRTL() {
       }
     }
     // Edit
-    else if (long(m_vItems[i]->szClass) == 0x81) {
+    else if ((ULONG_PTR)(m_vItems[i]->szClass) == 0x81) {
       if ((m_vItems[i]->dwStyle & ES_CENTER) == 0) {
         m_vItems[i]->dwStyle ^= ES_RIGHT;
       }
     }
     // Static
-    else if (long(m_vItems[i]->szClass) == 0x82) {
+    else if ((ULONG_PTR)(m_vItems[i]->szClass) == 0x82) {
       if ((m_vItems[i]->dwStyle & SS_TYPEMASK) == SS_LEFT || (m_vItems[i]->dwStyle & SS_TYPEMASK) == SS_LEFTNOWORDWRAP)
       {
         m_vItems[i]->dwStyle &= ~SS_TYPEMASK;
@@ -571,7 +571,7 @@ BYTE* CDialogTemplate::Save(DWORD& dwSize) {
   // Write all of the items
   for (unsigned int i = 0; i < m_vItems.size(); i++) {
     // DLGITEMTEMPLATE[EX]s must be aligned on DWORD boundary
-    if (DWORD(seeker - pbDlg) % sizeof(DWORD))
+    if ((seeker - pbDlg) % sizeof(DWORD))
       seeker += sizeof(WORD);
 
     if (m_bExtended) {
@@ -622,7 +622,7 @@ BYTE* CDialogTemplate::Save(DWORD& dwSize) {
     }
   }
 
-  assert((DWORD) seeker - (DWORD) pbDlg == dwSize);
+  assert((DWORD)(seeker - pbDlg) == dwSize);
 
   // DONE!
   return pbDlg;
diff --git a/Source/Platform.h b/Source/Platform.h
index b4aaf2cb..56c13347 100644
--- a/Source/Platform.h
+++ b/Source/Platform.h
@@ -56,6 +56,18 @@ typedef unsigned char UCHAR;
 typedef const char *LPCCH, *PCSTR, *LPCSTR;
 typedef unsigned short WCHAR, OLECHAR, *PWCHAR, *LPWCH, *PWCH, *NWPSTR, *LPWSTR, *PWSTR, *BSTR;
 typedef const unsigned short *LPCWCH, *PCWCH, *LPCWSTR, *PCWSTR, *LPCOLESTR;
+#ifdef  _UNICODE
+typedef WCHAR   TCHAR;
+#define _T(x)   L##x
+#define TEXT(x) L##x
+#define _tctime _wctime
+#else
+typedef CHAR    TCHAR;
+#define _T(x)   x
+#define TEXT(x) x
+#define _tctime ctime
+#endif
+typedef int INT_PTR;
 typedef unsigned int UINT_PTR;
 // basic stuff
 typedef void * HANDLE;
@@ -63,8 +75,8 @@ typedef HANDLE HWND;
 typedef HANDLE HMODULE;
 typedef unsigned long HKEY;
 // some gdi
-typedef unsigned long COLORREF;
-typedef unsigned long HBRUSH;
+typedef DWORD COLORREF;
+typedef UINT32 HBRUSH;
 // bool
 #  define FALSE 0
 #  define TRUE 1
@@ -88,6 +100,11 @@ typedef double LONGLONG,DWORDLONG;
 typedef LONGLONG *PLONGLONG;
 typedef DWORDLONG *PDWORDLONG;
 typedef DWORDLONG ULONGLONG,*PULONGLONG;
+
+// function mapping
+#define _strdup strdup
+#define _snprintf snprintf
+#define _vsnprintf vsnprintf
 #endif
 
 #ifndef __BIG_ENDIAN__
@@ -169,7 +186,7 @@ typedef DWORDLONG ULONGLONG,*PULONGLONG;
 #    define MAKEINTRESOURCE MAKEINTRESOURCEA
 #  endif
 #  ifndef IMAGE_FIRST_SECTION
-#    define IMAGE_FIRST_SECTION(h) ( PIMAGE_SECTION_HEADER( (DWORD) h + \
+#    define IMAGE_FIRST_SECTION(h) ( PIMAGE_SECTION_HEADER( (ULONG_PTR) h + \
                                      FIELD_OFFSET(IMAGE_NT_HEADERS, OptionalHeader) + \
                                      FIX_ENDIAN_INT16(PIMAGE_NT_HEADERS(h)->FileHeader.SizeOfOptionalHeader) ) )
 #  endif
@@ -177,7 +194,7 @@ typedef DWORDLONG ULONGLONG,*PULONGLONG;
 #    define RGB(r,g,b) ((DWORD)(((BYTE)(r)|((WORD)(g)<<8))|(((DWORD)(BYTE)(b))<<16)))
 #  endif
 #  ifndef MAKELONG
-#    define MAKELONG(a,b) ((LONG)(((WORD)(a))|(((DWORD)((WORD)(b)))<<16)))
+#    define MAKELONG(a,b) ((DWORD)(((WORD)(a))|(((DWORD)((WORD)(b)))<<16)))
 #  endif
 #endif
 #ifndef IS_INTRESOURCE
@@ -202,8 +219,10 @@ typedef DWORDLONG ULONGLONG,*PULONGLONG;
 #  define FOF_NOERRORUI 0x0400
 #endif
 
-#ifndef ULONG_PTR
-#  define ULONG_PTR DWORD
+// mingw32 and w64-mingw32 do not define ULONG_PTR
+// but rather declare ULONG_PTR via typedef (see basetsd.h)
+#if !defined(__MINGW32__) && !defined(ULONG_PTR)
+#  define ULONG_PTR unsigned long
 #endif
 
 #ifndef IDC_HAND
@@ -243,7 +262,7 @@ typedef DWORDLONG ULONGLONG,*PULONGLONG;
 #  undef INVALID_FILE_ATTRIBUTES
 #endif
 #ifndef INVALID_FILE_ATTRIBUTES
-#  define INVALID_FILE_ATTRIBUTES ((unsigned long) -1)
+#  define INVALID_FILE_ATTRIBUTES ((DWORD) -1)
 #endif
 
 // shell folders
diff --git a/Source/Plugins.cpp b/Source/Plugins.cpp
index 2fdc5239..100d20d3 100644
--- a/Source/Plugins.cpp
+++ b/Source/Plugins.cpp
@@ -29,7 +29,7 @@
 #include "dirreader.h"
 
 #ifdef _WIN32
-#  include <WinNT.h>
+#  include <winnt.h>
 #else
 #  include <sys/stat.h>
 #endif
@@ -136,8 +136,8 @@ void Plugins::GetExports(const tstring &pathToDll, bool displayInfo)
         DWORD prd = FIX_ENDIAN_INT32(sections[i].PointerToRawData);
         PIMAGE_EXPORT_DIRECTORY exports = PIMAGE_EXPORT_DIRECTORY(&dlldata[0] + prd + ExportDirVA - va);
         DWORD na = FIX_ENDIAN_INT32(exports->AddressOfNames);
-        unsigned long *names = (unsigned long*)((unsigned long) exports + (char *) na - ExportDirVA);
-        for (unsigned long j = 0; j < FIX_ENDIAN_INT32(exports->NumberOfNames); j++)
+        LPDWORD names = (LPDWORD)((ULONG_PTR)exports + na - ExportDirVA);
+        for (DWORD j = 0; j < FIX_ENDIAN_INT32(exports->NumberOfNames); j++)
         {
           const string name = string((char*)exports + FIX_ENDIAN_INT32(names[j]) - ExportDirVA);
           const tstring signature = dllName + _T("::") + name;
diff --git a/Source/ResourceEditor.cpp b/Source/ResourceEditor.cpp
index f4bf691a..d4a515e4 100644
--- a/Source/ResourceEditor.cpp
+++ b/Source/ResourceEditor.cpp
@@ -30,20 +30,10 @@ using namespace std;
 #define ALIGN(dwToAlign, dwAlignOn) dwToAlign = (dwToAlign%dwAlignOn == 0) ? dwToAlign : dwToAlign - (dwToAlign%dwAlignOn) + dwAlignOn
 #define RALIGN(dwToAlign, dwAlignOn) ((dwToAlign%dwAlignOn == 0) ? dwToAlign : dwToAlign - (dwToAlign%dwAlignOn) + dwAlignOn)
 
-#ifndef _WIN32
-static inline ULONG ConvertEndianness(ULONG u) {
-  return FIX_ENDIAN_INT32(u);
-}
-#endif
-
 static inline DWORD ConvertEndianness(DWORD d) {
   return FIX_ENDIAN_INT32(d);
 }
 
-static inline LONG ConvertEndianness(LONG l) {
-  return FIX_ENDIAN_INT32(l);
-}
-
 static inline WORD ConvertEndianness(WORD w) {
   return FIX_ENDIAN_INT16(w);
 }
@@ -55,7 +45,7 @@ PIMAGE_NT_HEADERS CResourceEditor::GetNTHeaders(BYTE* pbPE) {
     throw runtime_error("PE file contains invalid DOS header");
 
   // Get NT headers
-  PIMAGE_NT_HEADERS ntHeaders = (PIMAGE_NT_HEADERS)(pbPE + ConvertEndianness(dosHeader->e_lfanew));
+  PIMAGE_NT_HEADERS ntHeaders = (PIMAGE_NT_HEADERS)(pbPE + ConvertEndianness((DWORD)dosHeader->e_lfanew));
   if (ntHeaders->Signature != IMAGE_NT_SIGNATURE)
     throw runtime_error("PE file missing NT signature");
 
@@ -688,7 +678,7 @@ void CResourceEditor::WriteRsrcSec(BYTE* pbRsrcSec) {
     rdDir.NumberOfIdEntries = ConvertEndianness(rdDir.NumberOfIdEntries);
 
     CopyMemory(seeker, &rdDir, sizeof(IMAGE_RESOURCE_DIRECTORY));
-    crd->m_dwWrittenAt = DWORD(seeker);
+    crd->m_ulWrittenAt = (ULONG_PTR)(seeker);
     seeker += sizeof(IMAGE_RESOURCE_DIRECTORY);
 
     for (int i = 0; i < crd->CountEntries(); i++) {
@@ -709,7 +699,7 @@ void CResourceEditor::WriteRsrcSec(BYTE* pbRsrcSec) {
       rDirE.UName.NameString.NameIsString = (crd->GetEntry(i)->HasName()) ? 1 : 0;
 
       CopyMemory(seeker, &rDirE, sizeof(MY_IMAGE_RESOURCE_DIRECTORY_ENTRY));
-      crd->GetEntry(i)->m_dwWrittenAt = DWORD(seeker);
+      crd->GetEntry(i)->m_ulWrittenAt = (ULONG_PTR)(seeker);
       seeker += sizeof(MY_IMAGE_RESOURCE_DIRECTORY_ENTRY);
     }
     qDirs.pop();
@@ -725,7 +715,7 @@ void CResourceEditor::WriteRsrcSec(BYTE* pbRsrcSec) {
     rDataE.Size = ConvertEndianness(cRDataE->GetSize());
 
     CopyMemory(seeker, &rDataE, sizeof(IMAGE_RESOURCE_DATA_ENTRY));
-    cRDataE->m_dwWrittenAt = DWORD(seeker);
+    cRDataE->m_ulWrittenAt = (ULONG_PTR)(seeker);
     seeker += sizeof(IMAGE_RESOURCE_DATA_ENTRY);
 
     qDataEntries.pop();
@@ -737,7 +727,7 @@ void CResourceEditor::WriteRsrcSec(BYTE* pbRsrcSec) {
   while (!qStrings.empty()) {
     CResourceDirectoryEntry* cRDirE = qStrings.front();
 
-    PMY_IMAGE_RESOURCE_DIRECTORY_ENTRY(cRDirE->m_dwWrittenAt)->UName.NameString.NameOffset = ConvertEndianness(DWORD(seeker) - DWORD(pbRsrcSec));
+    PMY_IMAGE_RESOURCE_DIRECTORY_ENTRY(cRDirE->m_ulWrittenAt)->UName.NameString.NameOffset = ConvertEndianness((DWORD) (seeker - pbRsrcSec));
 
     WCHAR* szName = cRDirE->GetName();
     WORD iLen = winchar_strlen(szName) + 1;
@@ -758,7 +748,7 @@ void CResourceEditor::WriteRsrcSec(BYTE* pbRsrcSec) {
   while (!qDataEntries2.empty()) {
     CResourceDataEntry* cRDataE = qDataEntries2.front();
     CopyMemory(seeker, cRDataE->GetData(), cRDataE->GetSize());
-    PIMAGE_RESOURCE_DATA_ENTRY(cRDataE->m_dwWrittenAt)->OffsetToData = ConvertEndianness(seeker - pbRsrcSec + m_dwResourceSectionVA);
+    PIMAGE_RESOURCE_DATA_ENTRY(cRDataE->m_ulWrittenAt)->OffsetToData = ConvertEndianness((DWORD)(seeker - pbRsrcSec) + m_dwResourceSectionVA);
 
     seeker += RALIGN(cRDataE->GetSize(), 8);
 
@@ -768,21 +758,21 @@ void CResourceEditor::WriteRsrcSec(BYTE* pbRsrcSec) {
   /*
    * Set all of the directory entries offsets.
    */
-  SetOffsets(m_cResDir, DWORD(pbRsrcSec));
+  SetOffsets(m_cResDir, (ULONG_PTR)(pbRsrcSec));
 }
 
 // Sets the offsets in directory entries
-void CResourceEditor::SetOffsets(CResourceDirectory* resDir, DWORD newResDirAt) {
+void CResourceEditor::SetOffsets(CResourceDirectory* resDir, ULONG_PTR newResDirAt) {
   for (int i = 0; i < resDir->CountEntries(); i++) {
-    PMY_IMAGE_RESOURCE_DIRECTORY_ENTRY rde = PMY_IMAGE_RESOURCE_DIRECTORY_ENTRY(resDir->GetEntry(i)->m_dwWrittenAt);
+    PMY_IMAGE_RESOURCE_DIRECTORY_ENTRY rde = PMY_IMAGE_RESOURCE_DIRECTORY_ENTRY(resDir->GetEntry(i)->m_ulWrittenAt);
     if (resDir->GetEntry(i)->IsDataDirectory()) {
       rde->UOffset.DirectoryOffset.DataIsDirectory = 1;
-      rde->UOffset.DirectoryOffset.OffsetToDirectory = resDir->GetEntry(i)->GetSubDirectory()->m_dwWrittenAt - newResDirAt;
+      rde->UOffset.DirectoryOffset.OffsetToDirectory = resDir->GetEntry(i)->GetSubDirectory()->m_ulWrittenAt - newResDirAt;
       rde->UOffset.OffsetToData = ConvertEndianness(rde->UOffset.OffsetToData);
       SetOffsets(resDir->GetEntry(i)->GetSubDirectory(), newResDirAt);
     }
     else {
-      rde->UOffset.OffsetToData = ConvertEndianness(resDir->GetEntry(i)->GetDataEntry()->m_dwWrittenAt - newResDirAt);
+      rde->UOffset.OffsetToData = ConvertEndianness((DWORD)(resDir->GetEntry(i)->GetDataEntry()->m_ulWrittenAt - newResDirAt));
     }
   }
 }
@@ -891,7 +881,7 @@ int CResourceDirectory::CountEntries() {
 // Returns -1 if can not be found
 int CResourceDirectory::Find(WCHAR* szName) {
   if (IS_INTRESOURCE(szName))
-    return Find((WORD) (DWORD) szName);
+    return Find((WORD) (ULONG_PTR) szName);
   else
     if (szName[0] == L'#')
       return Find(WORD(winchar_stoi(szName + 1)));
@@ -969,7 +959,7 @@ CResourceDirectoryEntry::CResourceDirectoryEntry(WCHAR* szName, CResourceDirecto
   if (IS_INTRESOURCE(szName)) {
     m_bHasName = false;
     m_szName = 0;
-    m_wId = (WORD) (DWORD) szName;
+    m_wId = (WORD) (ULONG_PTR) szName;
   }
   else {
     m_bHasName = true;
@@ -983,7 +973,7 @@ CResourceDirectoryEntry::CResourceDirectoryEntry(WCHAR* szName, CResourceDataEnt
   if (IS_INTRESOURCE(szName)) {
     m_bHasName = false;
     m_szName = 0;
-    m_wId = (WORD) (DWORD) szName;
+    m_wId = (WORD) (ULONG_PTR) szName;
   }
   else {
     m_bHasName = true;
diff --git a/Source/ResourceEditor.h b/Source/ResourceEditor.h
index a50ea519..352d9e04 100644
--- a/Source/ResourceEditor.h
+++ b/Source/ResourceEditor.h
@@ -29,7 +29,7 @@
 
 #include "Platform.h"
 #ifdef _WIN32
-#include <WinNT.h>
+#include <winnt.h>
 #else
 // all definitions for non Win32 platforms were taken from MinGW's free Win32 library
 #  define IMAGE_DIRECTORY_ENTRY_RESOURCE  2
@@ -159,7 +159,7 @@ private:
   CResourceDirectory* ScanDirectory(PRESOURCE_DIRECTORY rdRoot, PRESOURCE_DIRECTORY rdToScan);
 
   void WriteRsrcSec(BYTE* pbRsrcSec);
-  void SetOffsets(CResourceDirectory* resDir, DWORD newResDirAt);
+  void SetOffsets(CResourceDirectory* resDir, ULONG_PTR newResDirAt);
 
   DWORD AdjustVA(DWORD dwVirtualAddress, DWORD dwAdjustment);
   DWORD AlignVA(DWORD dwVirtualAddress);
@@ -183,7 +183,7 @@ public:
 
   void Destroy();
 
-  DWORD m_dwWrittenAt;
+  ULONG_PTR m_ulWrittenAt;
 
 private:
   IMAGE_RESOURCE_DIRECTORY m_rdDir;
@@ -207,7 +207,7 @@ public:
 
   CResourceDataEntry* GetDataEntry();
 
-  DWORD m_dwWrittenAt;
+  ULONG_PTR m_ulWrittenAt;
 
 private:
   bool m_bHasName;
@@ -235,7 +235,7 @@ public:
   DWORD GetCodePage();
   DWORD GetOffset();
 
-  DWORD m_dwWrittenAt;
+  ULONG_PTR m_ulWrittenAt;
 
 private:
   BYTE* m_pbData;
diff --git a/Source/ResourceVersionInfo.cpp b/Source/ResourceVersionInfo.cpp
index 73d290ba..fb13b942 100644
--- a/Source/ResourceVersionInfo.cpp
+++ b/Source/ResourceVersionInfo.cpp
@@ -149,7 +149,7 @@ int GetVersionHeader (LPSTR &p, WORD &wLength, WORD &wValueLength, WORD &wType)
     p += sizeof(WORD);
     szKey = (WCHAR*)p;
     p += (winchar_strlen(szKey) + 1) * sizeof (WCHAR);
-    while ( ((long)p % 4) != 0 )
+    while ( ((ULONG_PTR)p % 4) != 0 )
         p++;
     return p - baseP;    
 }
diff --git a/Source/build.cpp b/Source/build.cpp
index 7e24b836..ec3bef63 100644
--- a/Source/build.cpp
+++ b/Source/build.cpp
@@ -16,7 +16,6 @@
  * Unicode support added by Jim Park -- 08/07/2007
  */
 
-#include "tchar.h"
 #include "Platform.h"
 #include <stdio.h>
 #include "exehead/config.h"
diff --git a/Source/fileform.cpp b/Source/fileform.cpp
index e2cc79a7..e6f55322 100644
--- a/Source/fileform.cpp
+++ b/Source/fileform.cpp
@@ -151,7 +151,7 @@ void ctlcolors_writer::write(const ctlcolors *data)
   m_sink->write_int(data->text);
   m_sink->write_int(data->bkc);
   m_sink->write_int(data->lbStyle);
-  m_sink->write_int((int) data->bkb);
+  m_sink->write_int((INT_PTR) data->bkb);
   m_sink->write_int(data->bkmode);
   m_sink->write_int(data->flags);
 }
diff --git a/Source/lang.cpp b/Source/lang.cpp
index cb55dccb..d5fae88d 100644
--- a/Source/lang.cpp
+++ b/Source/lang.cpp
@@ -19,7 +19,6 @@
 #include "Platform.h"
 #include <stdio.h>
 #include <stdlib.h>
-#include "tchar.h"
 #include "build.h"
 #include "util.h"
 #include "DialogTemplate.h"
diff --git a/Source/mmap.cpp b/Source/mmap.cpp
index 3d0246fb..29623933 100644
--- a/Source/mmap.cpp
+++ b/Source/mmap.cpp
@@ -322,7 +322,7 @@ void MMapFile::release(void *pView, int size)
   if (!pView)
     return;
 
-  unsigned int alignment = ((unsigned int)pView) % m_iAllocationGranularity;
+  unsigned int alignment = ((ULONG_PTR)pView) % m_iAllocationGranularity;
   pView = (char *)pView - alignment;
   size += alignment;
 #ifdef _WIN32
diff --git a/Source/script.cpp b/Source/script.cpp
index bbcb895a..785c62b8 100644
--- a/Source/script.cpp
+++ b/Source/script.cpp
@@ -2129,7 +2129,7 @@ int CEXEBuild::doCommand(int which_token, LineParser &line)
         int k=line.gettoken_enum(1,rootkeys[0]);
         if (k == -1) k=line.gettoken_enum(1,rootkeys[1]);
         if (k == -1) PRINTHELP()
-        build_header.install_reg_rootkey=(int)rootkey_tab[k];
+        build_header.install_reg_rootkey=(INT_PTR)rootkey_tab[k];
         if (!build_header.install_reg_rootkey) PRINTHELP() // SHCTX is invalid here
         build_header.install_reg_key_ptr = add_string(line.gettoken_str(2),0);
         if (line.gettoken_str(2)[0] == _T('\\'))
@@ -5184,7 +5184,7 @@ int CEXEBuild::doCommand(int which_token, LineParser &line)
         int k=line.gettoken_enum(2,rootkeys[0]);
         if (k == -1) k=line.gettoken_enum(2,rootkeys[1]);
         if (ent.offsets[0] == -1 || k == -1) PRINTHELP()
-        ent.offsets[1]=(int)rootkey_tab[k];
+        ent.offsets[1]=(INT_PTR)rootkey_tab[k];
         ent.offsets[2]=add_string(line.gettoken_str(3));
         ent.offsets[3]=add_string(line.gettoken_str(4));
         if (which_token == TOK_READREGDWORD) ent.offsets[4]=1;
@@ -5216,7 +5216,7 @@ int CEXEBuild::doCommand(int which_token, LineParser &line)
         if (k == -1) k=line.gettoken_enum(a,rootkeys[1]);
         if (k == -1) PRINTHELP()
         ent.which=EW_DELREG;
-        ent.offsets[1]=(int)rootkey_tab[k];
+        ent.offsets[1]=(INT_PTR)rootkey_tab[k];
         ent.offsets[2]=add_string(line.gettoken_str(a+1));
         ent.offsets[3]=(which_token==TOK_DELETEREGKEY)?0:add_string(line.gettoken_str(a+2));
         if (line.gettoken_str(a+1)[0] == _T('\\'))
@@ -5236,7 +5236,7 @@ int CEXEBuild::doCommand(int which_token, LineParser &line)
         if (k == -1) k=line.gettoken_enum(1,rootkeys[1]);
         if (k == -1) PRINTHELP()
         ent.which=EW_WRITEREG;
-        ent.offsets[0]=(int)rootkey_tab[k];
+        ent.offsets[0]=(INT_PTR)rootkey_tab[k];
         ent.offsets[1]=add_string(line.gettoken_str(2));
         if (line.gettoken_str(2)[0] == _T('\\'))
           warning_fl(_T("%s: registry path name begins with \'\\\', may cause problems"),line.gettoken_str(0));
@@ -5305,7 +5305,7 @@ int CEXEBuild::doCommand(int which_token, LineParser &line)
         int k=line.gettoken_enum(2,rootkeys[0]);
         if (k == -1) k=line.gettoken_enum(2,rootkeys[1]);
         if (ent.offsets[0] == -1 || k == -1) PRINTHELP()
-        ent.offsets[1]=(int)rootkey_tab[k];
+        ent.offsets[1]=(INT_PTR)rootkey_tab[k];
         ent.offsets[2]=add_string(line.gettoken_str(3));
         ent.offsets[3]=add_string(line.gettoken_str(4));
         ent.offsets[4]=which_token == TOK_ENUMREGKEY;
diff --git a/Source/util.cpp b/Source/util.cpp
index df5d3c4a..792169e9 100644
--- a/Source/util.cpp
+++ b/Source/util.cpp
@@ -77,9 +77,9 @@ int update_bitmap(CResourceEditor* re, WORD id, const TCHAR* filename, int width
   }
 
   if (width != 0) {
-    LONG biWidth;
+    INT32 biWidth;
     fseek(f, 18, SEEK_SET); // Seek to the width member of the header
-    fread(&biWidth, sizeof(LONG), 1, f);
+    fread(&biWidth, sizeof(INT32), 1, f);
     FIX_ENDIAN_INT32_INPLACE(biWidth);
     if (width != biWidth) {
       fclose(f);
@@ -88,9 +88,9 @@ int update_bitmap(CResourceEditor* re, WORD id, const TCHAR* filename, int width
   }
 
   if (height != 0) {
-    LONG biHeight;
+    INT32 biHeight;
     fseek(f, 22, SEEK_SET); // Seek to the height member of the header
-    fread(&biHeight, sizeof(LONG), 1, f);
+    fread(&biHeight, sizeof(INT32), 1, f);
     FIX_ENDIAN_INT32_INPLACE(biHeight);
     // Bitmap height can be negative too...
     if (height != abs(biHeight)) {
@@ -687,8 +687,8 @@ static BOOL GetVxdVersion( LPCTSTR szFile, LPDWORD lpdwLen, LPVOID lpData )
   }
 
   // Find the beginning of the NT header at offset e_lfanew.
-  pNtExeHdr = (PIMAGE_NT_HEADERS) ( (DWORD) pView
-       + (DWORD) pDosExeHdr->e_lfanew );
+  pNtExeHdr = (PIMAGE_NT_HEADERS) ( (ULONG_PTR) pView
+       + pDosExeHdr->e_lfanew );
 
   // Check to make sure the file is a VxD.
   if ( (DWORD) pNtExeHdr->Signature != IMAGE_VXD_SIGNATURE ) 
@@ -726,8 +726,8 @@ static BOOL GetVxdVersion( LPCTSTR szFile, LPDWORD lpdwLen, LPVOID lpData )
   }
 
   // e32_winresoff contains the offset of the resource in the VxD.
-  pVerRes = (VXD_VERSION_RESOURCE *) ( (DWORD) pView
-       + (DWORD) pLEHdr->e32_winresoff );
+  pVerRes = (VXD_VERSION_RESOURCE *) ( (ULONG_PTR) pView
+       + pLEHdr->e32_winresoff );
   dwSize = pVerRes->dwResSize;
   pRawRes = &(pVerRes->bVerData);
 
@@ -778,7 +778,7 @@ static DWORD GetVxdVersionInfoSize( LPCTSTR szFile )
 
     // GetVxdVersion() will fail with ERROR_INSUFFICIENT_BUFFER and
     // the required buffer size will be returned in dwResult.
-    if ( GetLastError() == ERROR_INSUFFICIENT_BUFFER ) 
+    if ( dwError == ERROR_INSUFFICIENT_BUFFER ) 
     {
       SetLastError( 0 );
       return dwResult;