diff --git a/examples/client_basics.cc b/examples/client_basics.cc
index 27b3f1b..abf280d 100644
Binary files a/examples/client_basics.cc and b/examples/client_basics.cc differ
diff --git a/webcc/logger.cc b/webcc/logger.cc
index 2a69c6e..4509500 100644
--- a/webcc/logger.cc
+++ b/webcc/logger.cc
@@ -22,6 +22,8 @@
 
 #include "boost/filesystem.hpp"
 
+namespace bfs = boost::filesystem;
+
 namespace webcc {
 
 // -----------------------------------------------------------------------------
@@ -34,21 +36,24 @@ static const char* kLevelNames[] = {
 
 // -----------------------------------------------------------------------------
 
+static FILE* FOpen(const bfs::path& path, bool overwrite) {
+#if (defined(_WIN32) || defined(_WIN64))
+  return _wfopen(path.wstring().c_str(), overwrite ? L"w+" : L"a+");
+#else
+  return fopen(path.string().c_str(), overwrite ? "w+" : "a+");
+#endif  // defined(_WIN32) || defined(_WIN64)
+}
+
 struct Logger {
   Logger() : file(nullptr), modes(0) {
   }
 
-  void Init(const std::string& path, int _modes) {
+  void Init(const bfs::path& path, int _modes) {
     modes = _modes;
 
     // Create log file only if necessary.
     if ((modes & LOG_FILE) != 0 && !path.empty()) {
-      if ((modes & LOG_OVERWRITE) != 0) {
-        file = fopen(path.c_str(), "w+");
-      } else {
-        // Append to existing file.
-        file = fopen(path.c_str(), "a+");
-      }
+      file = FOpen(path, (modes & LOG_OVERWRITE) != 0);
     }
   }
 
@@ -153,33 +158,30 @@ static std::string GetThreadID() {
   return thread_id;
 }
 
-static bfs::path InitLogPath(const std::string& dir) {
+static bfs::path InitLogPath(const bfs::path& dir) {
   if (dir.empty()) {
     return bfs::current_path() / WEBCC_LOG_FILE_NAME;
   }
 
-  bfs::path path = bfs::path(dir);
-  if (!bfs::exists(path) || !bfs::is_directory(path)) {
+  if (!bfs::exists(dir) || !bfs::is_directory(dir)) {
     boost::system::error_code ec;
-    if (!bfs::create_directories(path, ec) || ec) {
+    if (!bfs::create_directories(dir, ec) || ec) {
       return bfs::path();
     }
   }
 
-  path /= WEBCC_LOG_FILE_NAME;
-  return path;
+  return (dir / WEBCC_LOG_FILE_NAME);
 }
 
-void LogInit(const std::string& dir, int modes) {
+void LogInit(const bfs::path& dir, int modes) {
+  // Suppose this is called from the main thread.
+  g_main_thread_id = DoGetThreadID();
+
   if ((modes & LOG_FILE) != 0) {
-    bfs::path path = InitLogPath(dir);
-    g_logger.Init(path.string(), modes);
+    g_logger.Init(InitLogPath(dir), modes);
   } else {
-    g_logger.Init("", modes);
+    g_logger.Init({}, modes);
   }
-
-  // Suppose LogInit() is called from the main thread.
-  g_main_thread_id = DoGetThreadID();
 }
 
 static std::string GetTimestamp() {
diff --git a/webcc/logger.h b/webcc/logger.h
index 48cbfc4..89b7cfd 100644
--- a/webcc/logger.h
+++ b/webcc/logger.h
@@ -9,6 +9,8 @@
 #include <cstring>  // for strrchr()
 #include <string>
 
+#include "boost/filesystem/path.hpp"
+
 // Log levels.
 // VERB is similar to DEBUG commonly used by other projects.
 // USER is for the users who want to log their own logs but don't want any
@@ -42,7 +44,7 @@ const int LOG_FILE_OVERWRITE = LOG_FILE | LOG_OVERWRITE;
 
 // Initialize logger.
 // If |dir| is empty, log file will be generated in current directory.
-void LogInit(const std::string& dir, int modes);
+void LogInit(const boost::filesystem::path& dir, int modes);
 
 void Log(int level, const char* file, int line, const char* format, ...);