diff --git a/internal/platform/implementation/windows/BUILD b/internal/platform/implementation/windows/BUILD
index f402f637..5075cec1 100644
--- a/internal/platform/implementation/windows/BUILD
+++ b/internal/platform/implementation/windows/BUILD
@@ -60,6 +60,7 @@ cc_library(
         "bluetooth_classic_socket.h",
         "condition_variable.h",
         "executor.h",
+        "file.h",
         "mutex.h",
         "scheduled_executor.h",
         "server_sync.h",
@@ -113,6 +114,7 @@ cc_library(
         "bluetooth_classic_server_socket.cc",
         "bluetooth_classic_socket.cc",
         "executor.cc",
+        "file.cc",
         "platform.cc",
         "scheduled_executor.cc",
         "submittable_executor.cc",
diff --git a/internal/platform/implementation/windows/file.cc b/internal/platform/implementation/windows/file.cc
new file mode 100644
index 00000000..df0aecb7
--- /dev/null
+++ b/internal/platform/implementation/windows/file.cc
@@ -0,0 +1,111 @@
+// Copyright 2020 Google LLC
+//
+// 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
+//
+//     https://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.
+
+#include "internal/platform/implementation/windows/file.h"
+
+#include <algorithm>
+#include <cstddef>
+#include <ios>
+#include <memory>
+#include <string>
+
+#include "absl/memory/memory.h"
+#include "absl/strings/string_view.h"
+#include "internal/platform/exception.h"
+#include "internal/platform/implementation/windows/utils.h"
+
+namespace location {
+namespace nearby {
+namespace windows {
+
+// InputFile
+std::unique_ptr<IOFile> IOFile::CreateInputFile(
+    const absl::string_view file_path, size_t size) {
+  return absl::WrapUnique(new IOFile(file_path, size));
+}
+
+IOFile::IOFile(const absl::string_view file_path, size_t size)
+    : path_(file_path) {
+  // Always open input file path as wide string on Windows platform.
+  std::wstring wide_path = string_to_wstring(std::string(file_path));
+  file_.open(wide_path, std::ios::binary | std::ios::in | std::ios::ate);
+
+  total_size_ = file_.tellg();
+  file_.seekg(0);
+}
+
+std::unique_ptr<IOFile> IOFile::CreateOutputFile(const absl::string_view path) {
+  return std::unique_ptr<IOFile>(new IOFile(path));
+}
+
+IOFile::IOFile(const absl::string_view file_path)
+    : file_(), path_(file_path), total_size_(0) {
+  // Always open input file path as wide string on Windows platform.
+  std::wstring wide_path = string_to_wstring(path_);
+  file_.open(wide_path, std::ios::binary | std::ios::out);
+}
+
+ExceptionOr<ByteArray> IOFile::Read(std::int64_t size) {
+  if (!file_.is_open()) {
+    return ExceptionOr<ByteArray>{Exception::kIo};
+  }
+
+  if (file_.peek() == EOF) {
+    return ExceptionOr<ByteArray>{ByteArray{}};
+  }
+
+  if (!file_.good()) {
+    return ExceptionOr<ByteArray>{Exception::kIo};
+  }
+
+  ByteArray bytes(size);
+  std::unique_ptr<char[]> read_bytes{new char[size]};
+  file_.read(read_bytes.get(), static_cast<ptrdiff_t>(size));
+  auto num_bytes_read = file_.gcount();
+  if (num_bytes_read == 0) {
+    return ExceptionOr<ByteArray>{Exception::kIo};
+  }
+
+  return ExceptionOr<ByteArray>(ByteArray(read_bytes.get(), num_bytes_read));
+}
+
+Exception IOFile::Close() {
+  if (file_.is_open()) {
+    file_.close();
+  }
+  return {Exception::kSuccess};
+}
+
+Exception IOFile::Write(const ByteArray& data) {
+  if (!file_.is_open()) {
+    return {Exception::kIo};
+  }
+
+  if (!file_.good()) {
+    return {Exception::kIo};
+  }
+
+  file_.write(data.data(), data.size());
+  file_.flush();
+  return {file_.good() ? Exception::kSuccess : Exception::kIo};
+}
+
+Exception IOFile::Flush() {
+  file_.flush();
+  return {file_.good() ? Exception::kSuccess : Exception::kIo};
+}
+
+}  // namespace windows
+}  // namespace nearby
+}  // namespace location
diff --git a/internal/platform/implementation/windows/file.h b/internal/platform/implementation/windows/file.h
new file mode 100644
index 00000000..435ea333
--- /dev/null
+++ b/internal/platform/implementation/windows/file.h
@@ -0,0 +1,62 @@
+// Copyright 2020 Google LLC
+//
+// 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
+//
+//     https://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 PLATFORM_IMPL_WINDOWS_FILE_H_
+#define PLATFORM_IMPL_WINDOWS_FILE_H_
+
+#include <cstdint>
+#include <fstream>
+#include <memory>
+#include <string>
+
+#include "absl/strings/string_view.h"
+#include "internal/platform/exception.h"
+#include "internal/platform/implementation/input_file.h"
+#include "internal/platform/implementation/output_file.h"
+
+namespace location {
+namespace nearby {
+namespace windows {
+
+class IOFile final : public api::InputFile, public api::OutputFile {
+ public:
+  static std::unique_ptr<IOFile> CreateInputFile(
+      const absl::string_view file_path, size_t size);
+
+  static std::unique_ptr<IOFile> CreateOutputFile(const absl::string_view path);
+
+  ExceptionOr<ByteArray> Read(std::int64_t size) override;
+
+  std::string GetFilePath() const override { return path_; }
+
+  std::int64_t GetTotalSize() const override { return total_size_; }
+  Exception Close() override;
+
+  Exception Write(const ByteArray& data) override;
+  Exception Flush() override;
+
+ private:
+  explicit IOFile(const absl::string_view file_path, size_t size);
+  explicit IOFile(const absl::string_view file_path);
+
+  std::fstream file_;
+  std::string path_;
+  std::int64_t total_size_;
+};
+
+}  // namespace windows
+}  // namespace nearby
+}  // namespace location
+
+#endif  // PLATFORM_IMPL_WINDOWS_FILE_H_
diff --git a/internal/platform/implementation/windows/platform.cc b/internal/platform/implementation/windows/platform.cc
index a6ca28e7..f25afc7f 100644
--- a/internal/platform/implementation/windows/platform.cc
+++ b/internal/platform/implementation/windows/platform.cc
@@ -28,7 +28,6 @@
 #include <string>
 
 #include "internal/platform/implementation/shared/count_down_latch.h"
-#include "internal/platform/implementation/shared/file.h"
 #include "internal/platform/implementation/windows/atomic_boolean.h"
 #include "internal/platform/implementation/windows/atomic_reference.h"
 #include "internal/platform/implementation/windows/ble.h"
@@ -38,6 +37,7 @@
 #include "internal/platform/implementation/windows/cancelable.h"
 #include "internal/platform/implementation/windows/condition_variable.h"
 #include "internal/platform/implementation/windows/executor.h"
+#include "internal/platform/implementation/windows/file.h"
 #include "internal/platform/implementation/windows/future.h"
 #include "internal/platform/implementation/windows/listenable_future.h"
 #include "internal/platform/implementation/windows/log_message.h"
@@ -46,6 +46,7 @@
 #include "internal/platform/implementation/windows/server_sync.h"
 #include "internal/platform/implementation/windows/settable_future.h"
 #include "internal/platform/implementation/windows/submittable_executor.h"
+#include "internal/platform/implementation/windows/utils.h"
 #include "internal/platform/implementation/windows/webrtc.h"
 #include "internal/platform/implementation/windows/wifi.h"
 #include "internal/platform/implementation/windows/wifi_hotspot.h"
@@ -170,7 +171,10 @@ std::string CreateOutputFileWithRename(absl::string_view path) {
   std::string target(sanitized_path);
 
   std::fstream file;
-  file.open(target, std::fstream::binary | std::fstream::in);
+
+  // Open file as std::wstring
+  file.open(windows::string_to_wstring(target),
+            std::fstream::binary | std::fstream::in);
 
   // While we successfully open the file, keep incrementing the count.
   while (!(file.rdstate() & std::ifstream::failbit)) {
@@ -178,7 +182,8 @@ std::string CreateOutputFileWithRename(absl::string_view path) {
 #undef StrCat
     target = absl::StrCat(folder, file_name1, " (", ++count, ")", file_name2);
     file.clear();
-    file.open(target, std::fstream::binary | std::fstream::in);
+    file.open(windows::string_to_wstring(target),
+              std::fstream::binary | std::fstream::in);
   }
 
   // The above leaves the file open, so close it.
@@ -309,13 +314,13 @@ std::unique_ptr<InputFile> ImplementationPlatform::CreateInputFile(
     PayloadId payload_id, std::int64_t total_size) {
   std::string parent_folder("");
   std::string file_name(std::to_string(payload_id));
-  return shared::IOFile::CreateInputFile(GetDownloadPath(file_name),
-                                         total_size);
+  return windows::IOFile::CreateInputFile(GetDownloadPath(file_name),
+                                          total_size);
 }
 
 std::unique_ptr<InputFile> ImplementationPlatform::CreateInputFile(
     absl::string_view file_path, size_t size) {
-  return shared::IOFile::CreateInputFile(file_path, size);
+  return windows::IOFile::CreateInputFile(file_path, size);
 }
 
 ABSL_DEPRECATED("This interface will be deleted in the near future.")
@@ -323,7 +328,7 @@ std::unique_ptr<OutputFile> ImplementationPlatform::CreateOutputFile(
     PayloadId payload_id) {
   std::string parent_folder("");
   std::string file_name(std::to_string(payload_id));
-  return shared::IOFile::CreateOutputFile(
+  return windows::IOFile::CreateOutputFile(
       GetDownloadPath(parent_folder, file_name));
 }
 
@@ -342,7 +347,7 @@ std::unique_ptr<OutputFile> ImplementationPlatform::CreateOutputFile(
     int result = SHCreateDirectoryExA(0, folder_path.data(), nullptr);
   }
 
-  return shared::IOFile::CreateOutputFile(file_path);
+  return windows::IOFile::CreateOutputFile(file_path);
 }
 
 // TODO(b/184975123): replace with real implementation.