diff -rupN --no-dereference Python-3.10.9/configure.ac Python-3.10.9-new/configure.ac
--- Python-3.10.9/configure.ac	2022-12-08 09:36:56.552024798 +0100
+++ Python-3.10.9-new/configure.ac	2022-12-08 09:36:56.557024799 +0100
@@ -5660,11 +5660,20 @@ case $host in
   *-*-mingw*)
     dnl 'PC/frozen_dllmain.c' - not yet
     PYTHON_OBJS_FROZENMAIN=
+    dnl Required for windows builds as Objects/exceptions.c require
+    dnl "errmap.h" from $srcdir/PC.
+    dnl Note we cannot use BASECPPFLAGS as autogenerated pyconfig.h
+    dnl has to be before customized located in ../PC.
+    dnl (-I. at end is workaround for setup.py logic)
+    CPPFLAGS="-I\$(srcdir)/PC $CPPFLAGS -I."
     ;;
 esac
 
 AC_SUBST(SRCDIRS)
 SRCDIRS="Parser Objects Python Modules Modules/_io Programs"
+case $host in
+  *-*-mingw*) SRCDIRS="$SRCDIRS PC";;
+esac
 AC_MSG_CHECKING(for build directories)
 for dir in $SRCDIRS; do
     if test ! -d $dir; then
@@ -5673,6 +5682,15 @@ for dir in $SRCDIRS; do
 done
 AC_MSG_RESULT(done)
 
+# For mingw build need additional library for linking
+case $host in
+  *-*-mingw*)
+    LIBS="$LIBS -lversion -lshlwapi"
+  ;;
+  *)
+  ;;
+esac
+
 # Availability of -O2:
 AC_MSG_CHECKING(for -O2)
 saved_cflags="$CFLAGS"
diff -rupN --no-dereference Python-3.10.9/Include/fileobject.h Python-3.10.9-new/Include/fileobject.h
--- Python-3.10.9/Include/fileobject.h	2022-12-06 19:31:21.000000000 +0100
+++ Python-3.10.9-new/Include/fileobject.h	2022-12-08 09:36:56.558024799 +0100
@@ -30,7 +30,7 @@ PyAPI_DATA(int) Py_UTF8Mode;
 #endif
 
 /* A routine to check if a file descriptor can be select()-ed. */
-#ifdef _MSC_VER
+#ifdef MS_WINDOWS
     /* On Windows, any socket fd can be select()-ed, no matter how high */
     #define _PyIsSelectable_fd(FD) (1)
 #else
diff -rupN --no-dereference Python-3.10.9/Makefile.pre.in Python-3.10.9-new/Makefile.pre.in
--- Python-3.10.9/Makefile.pre.in	2022-12-08 09:36:55.983024786 +0100
+++ Python-3.10.9-new/Makefile.pre.in	2022-12-08 09:36:56.558024799 +0100
@@ -776,7 +776,7 @@ regen-all: regen-opcode regen-opcode-tar
 ############################################################################
 # Special rules for object files
 
-Modules/getbuildinfo.o: $(PARSER_OBJS) \
+Modules/getbuildinfo.o: pythonnt_rc.h $(PARSER_OBJS) \
 		$(OBJECT_OBJS) \
 		$(PYTHON_OBJS) \
 		$(MODULE_OBJS) \
diff -rupN --no-dereference Python-3.10.9/Modules/getpath.c Python-3.10.9-new/Modules/getpath.c
--- Python-3.10.9/Modules/getpath.c	2022-12-06 19:31:21.000000000 +0100
+++ Python-3.10.9-new/Modules/getpath.c	2022-12-08 09:36:56.558024799 +0100
@@ -418,7 +418,7 @@ add_exe_suffix(wchar_t **progpath_p)
     /* Check for already have an executable suffix */
     size_t n = wcslen(progpath);
     size_t s = wcslen(EXE_SUFFIX);
-    if (wcsncasecmp(EXE_SUFFIX, progpath + n - s, s) == 0) {
+    if (_wcsnicmp(EXE_SUFFIX, progpath + n - s, s) == 0) {
         return _PyStatus_OK();
     }
 
diff -rupN --no-dereference Python-3.10.9/PC/dl_nt.c Python-3.10.9-new/PC/dl_nt.c
--- Python-3.10.9/PC/dl_nt.c	2022-12-06 19:31:21.000000000 +0100
+++ Python-3.10.9-new/PC/dl_nt.c	2022-12-08 09:36:56.558024799 +0100
@@ -10,6 +10,7 @@ forgotten) from the programmer.
 
 #include "Python.h"
 #include "windows.h"
+#include "pythonnt_rc.h"
 
 #ifdef Py_ENABLE_SHARED
 
diff -rupN --no-dereference Python-3.10.9/PC/errmap.h Python-3.10.9-new/PC/errmap.h
--- Python-3.10.9/PC/errmap.h	2022-12-06 19:31:21.000000000 +0100
+++ Python-3.10.9-new/PC/errmap.h	2022-12-08 09:36:56.559024799 +0100
@@ -1,3 +1,5 @@
+#include <windows.h>
+
 int
 winerror_to_errno(int winerror)
 {
diff -rupN --no-dereference Python-3.10.9/PC/python_nt.rc Python-3.10.9-new/PC/python_nt.rc
--- Python-3.10.9/PC/python_nt.rc	2022-12-06 19:31:21.000000000 +0100
+++ Python-3.10.9-new/PC/python_nt.rc	2022-12-08 09:36:56.559024799 +0100
@@ -39,7 +39,7 @@ BEGIN
             VALUE "FileVersion", PYTHON_VERSION
             VALUE "InternalName", "Python DLL\0"
             VALUE "LegalCopyright", PYTHON_COPYRIGHT "\0"
-            VALUE "OriginalFilename", ORIGINAL_FILENAME "\0"
+            VALUE "OriginalFilename", PYTHON_DLL_NAME "\0"
             VALUE "ProductName", "Python\0"
             VALUE "ProductVersion", PYTHON_VERSION
         END
diff -rupN --no-dereference Python-3.10.9/PC/python_ver_rc.h Python-3.10.9-new/PC/python_ver_rc.h
--- Python-3.10.9/PC/python_ver_rc.h	2022-12-06 19:31:21.000000000 +0100
+++ Python-3.10.9-new/PC/python_ver_rc.h	2022-12-08 09:36:56.559024799 +0100
@@ -15,6 +15,7 @@
 #else
 #   define PYTHON_DEBUG_EXT
 #endif
+#include "pythonnt_rc.h"
 
 /* e.g., 3.3.0a1
  * PY_VERSION comes from patchlevel.h