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diff --git a/src/main/native/windows/file.h b/src/main/native/windows/file.h
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+// Copyright 2017 The Bazel Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#ifndef BAZEL_SRC_MAIN_NATIVE_WINDOWS_FILE_H_
+#define BAZEL_SRC_MAIN_NATIVE_WINDOWS_FILE_H_
+
+#include <windows.h>
+
+#include <memory>
+#include <string>
+
+namespace bazel {
+namespace windows {
+
+using std::string;
+using std::unique_ptr;
+using std::wstring;
+
+template <typename char_type>
+bool HasUncPrefix(const char_type* path) {
+  return path[0] == '\\' && (path[1] == '\\' || path[1] == '?') &&
+         (path[2] == '.' || path[2] == '?') && path[3] == '\\';
+}
+
+// Keep in sync with j.c.g.devtools.build.lib.windows.WindowsFileOperations
+enum {
+  IS_JUNCTION_YES = 0,
+  IS_JUNCTION_NO = 1,
+  IS_JUNCTION_ERROR = 2,
+};
+
+// Determines whether `path` is a junction (or directory symlink).
+//
+// `path` should be an absolute, normalized, Windows-style path, with "\\?\"
+// prefix if it's longer than MAX_PATH.
+//
+// To read about differences between junctions and directory symlinks,
+// see http://superuser.com/a/343079. In Bazel we only ever create junctions.
+//
+// Returns:
+// - IS_JUNCTION_YES, if `path` exists and is either a directory junction or a
+//   directory symlink
+// - IS_JUNCTION_NO, if `path` exists but is neither a directory junction nor a
+//   directory symlink; also when `path` is a symlink to a directory but it was
+//   created using "mklink" instead of "mklink /d", as such symlinks don't
+//   behave the same way as directories (e.g. they can't be listed)
+// - IS_JUNCTION_ERROR, if `path` doesn't exist or some error occurred
+int IsJunctionOrDirectorySymlink(const WCHAR* path);
+
+// Computes the long version of `path` if it has any 8dot3 style components.
+// Returns true upon success and sets `result` to point to the buffer.
+// `path` must be an absolute, normalized, Windows style path, with a "\\?\"
+// prefix if it's longer than MAX_PATH. The result will have a "\\?\" prefix if
+// and only if `path` had one as well. (It's the caller's responsibility to keep
+// or remove this prefix.)
+bool GetLongPath(const WCHAR* path, unique_ptr<WCHAR[]>* result);
+
+// Opens a directory using CreateFileW.
+// `path` must be a valid Windows path, with "\\?\" prefix if it's long.
+// If `read_write` is true then the directory is opened for reading and writing,
+// otherwise only for reading.
+HANDLE OpenDirectory(const WCHAR* path, bool read_write);
+
+// Creates a junction at `name`, pointing to `target`.
+// Returns the empty string upon success, or a human-readable error message upon
+// failure.
+// Neither `junction_name` nor `junction_target` needs to have a "\\?\" prefix,
+// not even if they are longer than MAX_PATH, though it's okay if they do. This
+// function will add the right prefixes as necessary.
+string CreateJunction(const wstring& junction_name,
+                      const wstring& junction_target);
+
+}  // namespace windows
+}  // namespace bazel
+
+#endif  // BAZEL_SRC_MAIN_NATIVE_WINDOWS_FILE_H_