diff --git a/ueforth/Makefile b/ueforth/Makefile
index da789f5..d13a44e 100644
--- a/ueforth/Makefile
+++ b/ueforth/Makefile
@@ -3,17 +3,44 @@ GEN = $(OUT)/gen
 RES = $(OUT)/resources
 WEB = $(OUT)/web
 POSIX = $(OUT)/posix
+WINDOWS = $(OUT)/windows
 ARDUINO = $(OUT)/arduino
 
-CFLAGS=-O2 -Wall -Werror -I ./ -I $(OUT)
+CFLAGS = -Wall -Werror \
+         -O2 \
+         -fno-exceptions \
+         -s \
+         -fomit-frame-pointer \
+         -fno-stack-protector \
+         -fno-ident -Wl,--build-id=none \
+         -ffunction-sections -fdata-sections \
+         -Wl,--gc-sections \
+         -fmerge-all-constants \
+         -I ./ -I $(OUT)
+STRIP_ARGS = -S \
+             --strip-unneeded \
+             --remove-section=.note.gnu.gold-version \
+             --remove-section=.comment \
+             --remove-section=.note \
+             --remove-section=.note.gnu.build-id \
+             --remove-section=.note.ABI-tag
 LIBS=-ldl
 
+WIN_ARCH=i686
+WINFLAGS = -mwindows -luser32
+
 TARGETS = $(WEB)/terminal.html \
           $(WEB)/ueforth.js \
           $(POSIX)/ueforth \
+          $(WINDOWS)/uEforth.exe \
           $(ARDUINO)/ueforth.ino
 
-all: $(TARGETS) $(RES)/eforth.ico tests
+all: $(TARGETS) tests
+
+clean:
+	rm -rf $(OUT)
+
+# ---- TESTS ----
 
 tests: core_test
 
@@ -22,6 +49,8 @@ core_test: $(POSIX)/ueforth common/core_test.fs \
 	echo "include common/core_test.fs" | $< | \
         diff - common/core_test.fs.golden
 
+# ---- GENERATED ----
+
 $(GEN):
 	mkdir -p $@
 
@@ -29,6 +58,10 @@ POSIX_BOOT = common/boot.fs posix/posix.fs
 $(GEN)/posix_boot.h: common/source_to_string.js $(POSIX_BOOT) | $(GEN)
 	echo "ok" | cat $(POSIX_BOOT) - | $< boot >$@
 
+WINDOWS_BOOT = common/boot.fs
+$(GEN)/windows_boot.h: common/source_to_string.js $(WINDOWS_BOOT) | $(GEN)
+	echo "ok" | cat $(WINDOWS_BOOT) - | $< boot >$@
+
 ARDUINO_BOOT = common/boot.fs
 $(GEN)/arduino_boot.h: common/source_to_string.js $(ARDUINO_BOOT) | $(GEN)
 	echo "ok" | cat $(ARDUINO_BOOT) - | $< boot >$@
@@ -42,6 +75,8 @@ $(GEN)/web_cases.js: $(GEN)/dump_web_opcodes | $(GEN)
 $(GEN)/web_dict.js: $(GEN)/dump_web_opcodes | $(GEN)
 	$< dict >$@
 
+# ---- RESOURCES ----
+
 $(RES):
 	mkdir -p $@
 
@@ -65,6 +100,13 @@ ICON_SIZES = $(RES)/eforth256x256.png \
 $(RES)/eforth.ico: $(ICON_SIZES)
 	convert $^ $< $@
 
+WINDOWS_RESOURCES = $(RES)/ueforth_res.o
+
+$(WINDOWS_RESOURCES): windows/ueforth.rc $(RES)/eforth.ico
+	$(WIN_ARCH)-w64-mingw32-windres $< $@
+
+# ---- WEB ----
+
 $(WEB):
 	mkdir -p $(WEB)
 
@@ -79,6 +121,8 @@ $(WEB)/ueforth.js: \
         $(GEN)/web_cases.js | $(WEB)
 	$^ >$@
 
+# ---- POSIX ----
+
 $(POSIX):
 	mkdir -p $@
 
@@ -89,6 +133,22 @@ $(POSIX)/ueforth: \
     $(GEN)/posix_boot.h | $(POSIX)
 	$(CC) $(CFLAGS) $< -o $@ $(LIBS)
 
+# ---- WINDOWS ----
+
+$(WINDOWS):
+	mkdir -p $@
+
+$(WINDOWS)/uEforth.exe: \
+    windows/windows_main.c \
+    common/opcodes.h \
+    common/core.h \
+    $(GEN)/windows_boot.h \
+    $(WINDOWS_RESOURCES) | $(WINDOWS)
+	$(WIN_ARCH)-w64-mingw32-gcc \
+    $(CFLAGS) $(WINFLAGS) $< $(WINDOWS_RESOURCES) -o $@
+
+# ---- ARDUINO ----
+
 $(ARDUINO):
 	mkdir -p $@
 
@@ -100,5 +160,3 @@ $(ARDUINO)/ueforth.ino: \
         $(GEN)/arduino_boot.h | $(ARDUINO)
 	$^ >$@
 
-clean:
-	rm -rf $(OUT)
diff --git a/ueforth/common/calling.h b/ueforth/common/calling.h
new file mode 100644
index 0000000..1a6b21b
--- /dev/null
+++ b/ueforth/common/calling.h
@@ -0,0 +1,20 @@
+#define CALLING_OPCODE_LIST \
+  X("CALL0", OP_CALL0, tos = ((cell_t (*)()) tos)()) \
+  X("CALL1", OP_CALL1, tos = ((cell_t (*)()) tos)(*sp); --sp) \
+  X("CALL2", OP_CALL2, tos = ((cell_t (*)()) tos)(sp[-1], *sp); sp -= 2) \
+  X("CALL3", OP_CALL3, tos = ((cell_t (*)()) tos)(sp[-2], sp[-1], *sp); sp -= 3) \
+  X("CALL4", OP_CALL4, tos = ((cell_t (*)()) tos)(sp[-3], sp[-2], sp[-1], \
+              *sp); sp -= 4) \
+  X("CALL5", OP_CALL5, tos = ((cell_t (*)()) tos)(sp[-4], sp[-3], sp[-2], \
+              sp[-1], *sp); sp -= 5) \
+  X("CALL6", OP_CALL6, tos = ((cell_t (*)()) tos)(sp[-5], sp[-4], sp[-3], \
+              sp[-2], sp[-1], *sp); sp -= 6) \
+  X("CALL7", OP_CALL7, tos = ((cell_t (*)()) tos)(sp[-6], sp[-5], sp[-4], \
+              sp[-3], sp[-2], sp[-1], *sp); sp -= 7) \
+  X("CALL8", OP_CALL8, tos = ((cell_t (*)()) tos)(sp[-7], sp[-6], sp[-5], \
+              sp[-4], sp[-3], sp[-2], sp[-1], *sp); sp -= 8) \
+  X("CALL9", OP_CALL9, tos = ((cell_t (*)()) tos)(sp[-8], sp[-7], sp[-6], \
+              sp[-5], sp[-4], sp[-3], sp[-2], sp[-1], *sp); sp -= 9) \
+  X("CALL10", OP_CALL10, tos = ((cell_t (*)()) tos)(sp[-9], sp[-8], sp[-7], \
+              sp[-6], sp[-5], sp[-4], sp[-3], sp[-2], sp[-1], *sp); sp -= 10) \
+
diff --git a/ueforth/posix/posix_main.c b/ueforth/posix/posix_main.c
index 59c32b9..c4bb3d2 100644
--- a/ueforth/posix/posix_main.c
+++ b/ueforth/posix/posix_main.c
@@ -2,37 +2,21 @@
 #include <sys/mman.h>
 
 #include "common/opcodes.h"
+#include "common/calling.h"
 
+#define HEAP_SIZE (10 * 1024 * 1024)
 #define STACK_SIZE (16 * 1024)
 
 #define PLATFORM_OPCODE_LIST \
   X("DLSYM", OP_DLSYM, tos = (cell_t) dlsym((void *) *sp, (void *) tos); --sp) \
-  X("CALL0", OP_CALL0, tos = ((cell_t (*)()) tos)()) \
-  X("CALL1", OP_CALL1, tos = ((cell_t (*)()) tos)(*sp); --sp) \
-  X("CALL2", OP_CALL2, tos = ((cell_t (*)()) tos)(sp[-1], *sp); sp -= 2) \
-  X("CALL3", OP_CALL3, tos = ((cell_t (*)()) tos)(sp[-2], sp[-1], *sp); sp -= 3) \
-  X("CALL4", OP_CALL4, tos = ((cell_t (*)()) tos)(sp[-3], sp[-2], sp[-1], \
-              *sp); sp -= 4) \
-  X("CALL5", OP_CALL5, tos = ((cell_t (*)()) tos)(sp[-4], sp[-3], sp[-2], \
-              sp[-1], *sp); sp -= 5) \
-  X("CALL6", OP_CALL6, tos = ((cell_t (*)()) tos)(sp[-5], sp[-4], sp[-3], \
-              sp[-2], sp[-1], *sp); sp -= 6) \
-  X("CALL7", OP_CALL7, tos = ((cell_t (*)()) tos)(sp[-6], sp[-5], sp[-4], \
-              sp[-3], sp[-2], sp[-1], *sp); sp -= 7) \
-  X("CALL8", OP_CALL8, tos = ((cell_t (*)()) tos)(sp[-7], sp[-6], sp[-5], \
-              sp[-4], sp[-3], sp[-2], sp[-1], *sp); sp -= 8) \
-  X("CALL9", OP_CALL9, tos = ((cell_t (*)()) tos)(sp[-8], sp[-7], sp[-6], \
-              sp[-5], sp[-4], sp[-3], sp[-2], sp[-1], *sp); sp -= 9) \
-  X("CALL10", OP_CALL10, tos = ((cell_t (*)()) tos)(sp[-9], sp[-8], sp[-7], \
-              sp[-6], sp[-5], sp[-4], sp[-3], sp[-2], sp[-1], *sp); sp -= 10) \
+  CALLING_OPCODE_LIST \
 
 #include "common/core.h"
 
 #include "gen/posix_boot.h"
 
-#define HEAP_SIZE (10 * 1024 * 1024)
-
 int main(int argc, char *argv[]) {
   void *heap = mmap(0, HEAP_SIZE, PROT_EXEC | PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
   ueforth(argc, argv, heap, boot, sizeof(boot));
+  return 1;
 }
diff --git a/ueforth/windows/ueforth.rc b/ueforth/windows/ueforth.rc
new file mode 100644
index 0000000..4039ca6
--- /dev/null
+++ b/ueforth/windows/ueforth.rc
@@ -0,0 +1 @@
+IDI_MAIN_ICON ICON "out/resources/eforth.ico"
diff --git a/ueforth/windows/windows_main.c b/ueforth/windows/windows_main.c
new file mode 100644
index 0000000..9ea758f
--- /dev/null
+++ b/ueforth/windows/windows_main.c
@@ -0,0 +1,25 @@
+#include "windows.h"
+
+#include "common/opcodes.h"
+#include "common/calling.h"
+
+#define HEAP_SIZE (10 * 1024 * 1024)
+#define STACK_SIZE (16 * 1024)
+
+#define PLATFORM_OPCODE_LIST \
+  X("GETPROCADDRES", OP_GETPROCADDRESS, \
+      tos = (cell_t) GetProcAddress((HMODULE) *sp, (LPCSTR) tos); --sp) \
+  CALLING_OPCODE_LIST \
+
+#include "common/core.h"
+
+#include "gen/windows_boot.h"
+
+int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrev,
+                   PSTR pCmdLine, int nCmdShow) {
+  void *heap = VirtualAlloc(
+      NULL, HEAP_SIZE, MEM_RESERVE | MEM_COMMIT, PAGE_EXECUTE_READWRITE);
+  ueforth(0, 0, heap, boot, sizeof(boot));
+  return 1;
+}
+