diff --git a/src/rime/gear/simplifier.cc b/src/rime/gear/simplifier.cc
index 073e3f0e7..610919437 100644
--- a/src/rime/gear/simplifier.cc
+++ b/src/rime/gear/simplifier.cc
@@ -197,7 +197,7 @@ Simplifier::Simplifier(const Ticket& ticket)
 void Simplifier::Initialize() {
   initialized_ = true;  // no retry
   path opencc_config_path = path(opencc_config_);
-  if (opencc_config_path.extension().string() == ".ini") {
+  if (opencc_config_path.extension().u8string() == ".ini") {
     LOG(ERROR) << "please upgrade opencc_config to an opencc 1.0 config file.";
     return;
   }
diff --git a/src/rime/lever/deployment_tasks.cc b/src/rime/lever/deployment_tasks.cc
index c141f08e2..05336f27c 100644
--- a/src/rime/lever/deployment_tasks.cc
+++ b/src/rime/lever/deployment_tasks.cc
@@ -54,8 +54,8 @@ bool DetectModifications::Run(Deployer* deployer) {
         for (fs::directory_iterator iter(p), end; iter != end; ++iter) {
           path entry(iter->path());
           if (fs::is_regular_file(fs::canonical(entry)) &&
-              entry.extension().string() == ".yaml" &&
-              entry.filename().string() != "user.yaml") {
+              entry.extension().u8string() == ".yaml" &&
+              entry.filename().u8string() != "user.yaml") {
             last_modified =
                 (std::max)(last_modified,
                            filesystem::to_time_t(fs::last_write_time(entry)));
@@ -458,7 +458,7 @@ bool PrebuildAllSchemas::Run(Deployer* deployer) {
   for (fs::directory_iterator iter(shared_data_path), end; iter != end;
        ++iter) {
     path entry(iter->path());
-    if (boost::ends_with(entry.filename().string(), ".schema.yaml")) {
+    if (boost::ends_with(entry.filename().u8string(), ".schema.yaml")) {
       the<DeploymentTask> t(new SchemaUpdate(entry));
       if (!t->Run(deployer))
         success = false;
@@ -523,7 +523,7 @@ bool UserDictSync::Run(Deployer* deployer) {
 }
 
 static bool IsCustomizedCopy(const path& file_path) {
-  auto file_name = file_path.filename().string();
+  auto file_name = file_path.filename().u8string();
   if (boost::ends_with(file_name, ".yaml") &&
       !boost::ends_with(file_name, ".custom.yaml")) {
     Config config;
@@ -550,7 +550,7 @@ bool BackupConfigFiles::Run(Deployer* deployer) {
     path entry(iter->path());
     if (!fs::is_regular_file(entry))
       continue;
-    auto file_extension = entry.extension().string();
+    auto file_extension = entry.extension().u8string();
     bool is_yaml_file = file_extension == ".yaml";
     bool is_text_file = file_extension == ".txt";
     if (!is_yaml_file && !is_text_file)
@@ -590,7 +590,7 @@ bool CleanupTrash::Run(Deployer* deployer) {
     path entry(iter->path());
     if (!fs::is_regular_file(entry))
       continue;
-    auto file_name = entry.filename().string();
+    auto file_name = entry.filename().u8string();
     if (file_name == "rime.log" || boost::ends_with(file_name, ".bin") ||
         boost::ends_with(file_name, ".reverse.kct") ||
         boost::ends_with(file_name, ".userdb.kct.old") ||
@@ -643,7 +643,7 @@ bool CleanOldLogFiles::Run(Deployer* deployer) {
     try {
       // preparing files
       for (const auto& entry : fs::directory_iterator(dir)) {
-        const string& file_name(entry.path().filename().string());
+        const string& file_name(entry.path().filename().u8string());
         if (entry.is_regular_file() && !entry.is_symlink() &&
             boost::starts_with(file_name, app_name) &&
             boost::ends_with(file_name, ".log") &&
diff --git a/src/rime/lever/switcher_settings.cc b/src/rime/lever/switcher_settings.cc
index 6d9763cd2..71ddcddd7 100644
--- a/src/rime/lever/switcher_settings.cc
+++ b/src/rime/lever/switcher_settings.cc
@@ -54,7 +54,7 @@ void SwitcherSettings::GetAvailableSchemasFromDirectory(const path& dir) {
   }
   for (fs::directory_iterator it(dir), end; it != end; ++it) {
     path file_path(it->path());
-    if (boost::ends_with(file_path.string(), ".schema.yaml")) {
+    if (boost::ends_with(file_path.u8string(), ".schema.yaml")) {
       Config config;
       if (config.LoadFromFile(file_path)) {
         SchemaInfo info;
@@ -86,6 +86,7 @@ void SwitcherSettings::GetAvailableSchemasFromDirectory(const path& dir) {
           }
         }
         config.GetString("schema/description", &info.description);
+        // output path in native encoding.
         info.file_path = file_path.string();
         available_.push_back(info);
       }