diff --git a/ioutil.c b/ioutil.c
index 26c6254..65bd944 100644
--- a/ioutil.c
+++ b/ioutil.c
@@ -2,6 +2,9 @@
 #include <string.h>
 #include "types.h"
 #include "ioutil.h"
+
+#ifndef _WIN32
+
 #include <errno.h>
 #include <sys/stat.h>
 #include <fcntl.h>
@@ -51,6 +54,52 @@ int closefile(FH fd)
 	return 0;
 }
 
+int createdir(const char *path,int secret)
+{
+	return mkdir(path,secret ? 0700 : 0777);
+}
+
+#else
+
+int writeall(FH fd,const u8 *data,size_t len)
+{
+	DWORD wrote;
+	BOOL success;
+	while (len) {
+		success = WriteFile(fd,data,
+			len <= (DWORD)-1 ? (DWORD)len : (DWORD)-1,&wrote,0);
+		if (!success)
+			return -1;
+		data += wrote;
+		if (len >= wrote)
+			len -= wrote;
+		else
+			len = 0;
+	}
+	return 0;
+}
+
+FH createfile(const char *path,int secret)
+{
+	// XXX no support for non-ascii chars
+	// XXX don't know how to handle secret argument
+	(void) secret;
+	return CreateFileA(path,GENERIC_WRITE,0,0,CREATE_ALWAYS,0,0);
+}
+
+int closefile(FH fd)
+{
+	return CloseHandle(fd) ? 0 : -1;
+}
+
+int createdir(const char *path,int secret)
+{
+	// XXX don't know how to handle secret argument
+	return CreateDirectoryA(path,0) ? 0 : -1;
+}
+
+#endif
+
 int writetofile(const char *path,const u8 *data,size_t len,int secret)
 {
 	FH fd = createfile(path,secret);
@@ -60,8 +109,3 @@ int writetofile(const char *path,const u8 *data,size_t len,int secret)
 		return -1;
 	return wret;
 }
-
-int createdir(const char *path,int secret)
-{
-	return mkdir(path,secret ? 0700 : 0777);
-}
diff --git a/ioutil.h b/ioutil.h
index 7255a2e..c7a1dab 100644
--- a/ioutil.h
+++ b/ioutil.h
@@ -1,6 +1,18 @@
+
+#ifndef _WIN32
+
 typedef int FH;
 #define FH_invalid -1
 
+#else
+
+#define UNICODE 1
+#include <windows.h>
+typedef HANDLE FH;
+#define FH_invalid INVALID_HANDLE_VALUE
+
+#endif
+
 FH createfile(const char *path,int secret);
 int closefile(FH fd);
 int writeall(FH,const u8 *data,size_t len);