diff --git a/llvm/lib/System/Win32/MappedFile.cpp b/llvm/lib/System/Win32/MappedFile.cpp
new file mode 100644
index 0000000..d106eb1
--- /dev/null
+++ b/llvm/lib/System/Win32/MappedFile.cpp
@@ -0,0 +1,38 @@
+//===- Win32/MappedFile.cpp - Win32 MappedFile Implementation ---*- C++ -*-===//
+// 
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Reid Spencer and is distributed under the 
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+// 
+//===----------------------------------------------------------------------===//
+//
+// This file provides the Win32 specific implementation of the MappedFile
+// concept.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Win32.h"
+
+void MappedFile::initialize() {
+}
+
+void MappedFile::terminate() {
+}
+
+void MappedFile::unmap() {
+}
+
+void* MappedFile::map() {
+  static char junk[4096];
+  return junk;
+}
+
+size_t MappedFile::size() {
+  return 4096;
+}
+
+void MappedFile::size(size_t new_size) {
+}
+
+// vim: sw=2 smartindent smarttab tw=80 autoindent expandtab