diff --git a/native/factor.c b/native/factor.c
index 027a2a87c7..66c5cd83c3 100644
--- a/native/factor.c
+++ b/native/factor.c
@@ -6,7 +6,11 @@ void init_factor(char* image)
 	load_image(image);
 	init_stacks();
 	init_io();
+
+#ifdef WIN32
 	init_signals();
+#endif
+
 	init_compiler();
 	init_errors();
 	gc_time = 0;
diff --git a/native/file.c b/native/unix/file.c
similarity index 98%
rename from native/file.c
rename to native/unix/file.c
index 9f7f58579a..52183e24c1 100644
--- a/native/file.c
+++ b/native/unix/file.c
@@ -1,4 +1,4 @@
-#include "factor.h"
+#include "../factor.h"
 
 void primitive_open_file(void)
 {
@@ -97,3 +97,4 @@ void primitive_cd(void)
 	maybe_garbage_collection();
 	chdir(unbox_c_string());
 }
+
diff --git a/native/win32/file.c b/native/win32/file.c
new file mode 100644
index 0000000000..13ee48d561
--- /dev/null
+++ b/native/win32/file.c
@@ -0,0 +1,114 @@
+#include "../factor.h"
+
+void primitive_open_file(void) 
+{
+	bool write = unbox_boolean();
+	bool read = unbox_boolean();
+	char *path;
+	DWORD mode = 0, create = 0;
+	HANDLE fp;
+	SECURITY_ATTRIBUTES sa;
+
+	path = unbox_c_string();
+
+	mode |= write ? GENERIC_WRITE : 0;
+	mode |= read ? GENERIC_READ : 0;
+
+	if (read && write)
+		create = OPEN_ALWAYS;
+	else if (read)
+		create = OPEN_EXISTING;
+	else if (write)
+		create = CREATE_ALWAYS;
+
+	sa.nLength = sizeof(SECURITY_ATTRIBUTES);
+	sa.lpSecurityDescriptor = NULL;
+	sa.bInheritHandle = true;
+
+	fp = CreateFile(
+		path, 
+		mode, 
+		FILE_SHARE_DELETE|FILE_SHARE_READ|FILE_SHARE_WRITE,
+		&sa,
+		create,
+		/* FILE_FLAG_OVERLAPPED TODO */0, 
+		NULL);
+
+	if (fp == INVALID_HANDLE_VALUE) 
+	{
+		io_error(__FUNCTION__);
+	} 
+	else 
+	{
+		CreateIoCompletionPort(fp, completion_port, 0, 0);
+		dpush(read ? tag_object(port(PORT_READ, (CELL)fp)) : F);
+		dpush(write ? tag_object(port(PORT_WRITE, (CELL)fp)) : F);
+	}
+}
+
+void primitive_stat(void)
+{
+	F_STRING *path;
+	WIN32_FILE_ATTRIBUTE_DATA st;
+
+	maybe_garbage_collection();
+	path = untag_string(dpop());
+
+	if(!GetFileAttributesEx(to_c_string(path), GetFileExInfoStandard, &st)) 
+	{
+		dpush(F);
+	} 
+	else 
+	{
+		CELL dirp = tag_boolean(st.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY);
+		CELL size = tag_object(s48_long_long_to_bignum(
+			(int64_t)st.nFileSizeLow | (int64_t)st.nFileSizeHigh << 32));
+		CELL mtime = tag_integer((int)(*(int64_t*)&st.ftLastWriteTime / 100000000 - 172456224));
+		dpush(
+			cons(dirp,
+			cons(tag_fixnum(0),
+			cons(size,
+			cons(mtime, F)))));
+	}
+}
+
+void primitive_read_dir(void)
+{
+	F_STRING *path;
+	HANDLE dir;
+	WIN32_FIND_DATA find_data;
+	CELL result = F;
+
+	maybe_garbage_collection();
+
+	path = untag_string(dpop());
+	if (INVALID_HANDLE_VALUE != (dir = FindFirstFile(".\\*", &find_data)))
+	{
+		do 
+		{
+			CELL name = tag_object(from_c_string(find_data.cFileName));
+			result = cons(name, result);
+		} 
+		while (FindNextFile(dir, &find_data));
+		CloseHandle(dir);
+	}
+
+	dpush(result);
+}
+
+void primitive_cwd(void)
+{
+	char buf[MAX_PATH];
+
+	maybe_garbage_collection();
+	if(!GetCurrentDirectory(MAX_PATH, buf))
+		io_error(__FUNCTION__);
+
+	box_c_string(buf);
+}
+
+void primitive_cd(void)
+{
+	maybe_garbage_collection();
+	SetCurrentDirectory(unbox_c_string());
+}
\ No newline at end of file