diff --git a/src/libslic3r/Print.cpp b/src/libslic3r/Print.cpp
index 544b4e382..1e4a01a5b 100644
--- a/src/libslic3r/Print.cpp
+++ b/src/libslic3r/Print.cpp
@@ -2212,7 +2212,8 @@ int Print::get_hrc_by_nozzle_type(const NozzleType&type)
     static std::map<std::string, int>nozzle_type_to_hrc;
     if (nozzle_type_to_hrc.empty()) {
         fs::path file_path = fs::path(resources_dir()) / "info" / "nozzle_info.json";
-        std::ifstream in(file_path.string());
+        boost::nowide::ifstream in(file_path.string());
+        //std::ifstream in(file_path.string());
         json j;
         try {
             j = json::parse(in);
diff --git a/src/slic3r/GUI/DeviceManager.cpp b/src/slic3r/GUI/DeviceManager.cpp
index 7682d36a1..2280c270b 100644
--- a/src/slic3r/GUI/DeviceManager.cpp
+++ b/src/slic3r/GUI/DeviceManager.cpp
@@ -5534,7 +5534,7 @@ std::vector<std::string> DeviceManager::get_resolution_supported(std::string typ
     std::vector<std::string> resolution_supported;
 
     std::string config_file = Slic3r::resources_dir() + "/printers/" + type_str + ".json";
-    std::ifstream json_file(config_file.c_str());
+    boost::nowide::ifstream json_file(config_file.c_str());
     try {
         json jj;
         if (json_file.is_open()) {
@@ -5556,7 +5556,7 @@ std::vector<std::string> DeviceManager::get_compatible_machine(std::string type_
 {
     std::vector<std::string> compatible_machine;
     std::string config_file = Slic3r::resources_dir() + "/printers/" + type_str + ".json";
-    std::ifstream json_file(config_file.c_str());
+    boost::nowide::ifstream json_file(config_file.c_str());
     try {
         json jj;
         if (json_file.is_open()) {
@@ -5575,10 +5575,12 @@ std::vector<std::string> DeviceManager::get_compatible_machine(std::string type_
 }
 
 
-bool DeviceManager::load_filaments_blacklist_config(std::string config_file)
+bool DeviceManager::load_filaments_blacklist_config()
 {
     filaments_blacklist = json::object();
-    std::ifstream json_file(config_file.c_str());
+
+    std::string config_file = Slic3r::resources_dir() + "/printers/filaments_blacklist.json";
+    boost::nowide::ifstream json_file(config_file.c_str());
 
     try {
         if (json_file.is_open()) {
diff --git a/src/slic3r/GUI/DeviceManager.hpp b/src/slic3r/GUI/DeviceManager.hpp
index 10c1e8bf3..d8e885e0c 100644
--- a/src/slic3r/GUI/DeviceManager.hpp
+++ b/src/slic3r/GUI/DeviceManager.hpp
@@ -1029,7 +1029,7 @@ public:
     static bool        get_printer_is_enclosed(std::string type_str);
     static std::vector<std::string> get_resolution_supported(std::string type_str);
     static std::vector<std::string> get_compatible_machine(std::string type_str);
-    static bool load_filaments_blacklist_config(std::string config_file);
+    static bool load_filaments_blacklist_config();
     static void check_filaments_in_blacklist(std::string tag_vendor, std::string tag_type, bool& in_blacklist, std::string& ac, std::string& info);
     static std::string load_gcode(std::string type_str, std::string gcode_file);
 };
diff --git a/src/slic3r/GUI/GUI_App.cpp b/src/slic3r/GUI/GUI_App.cpp
index e27cc9693..9a2c14020 100644
--- a/src/slic3r/GUI/GUI_App.cpp
+++ b/src/slic3r/GUI/GUI_App.cpp
@@ -1280,8 +1280,7 @@ void GUI_App::post_init()
         });
 
 
-    std::string filaments_blacklist_config_file = Slic3r::resources_dir() + "/printers/filaments_blacklist.json";
-    DeviceManager::load_filaments_blacklist_config(encode_path(filaments_blacklist_config_file.c_str()));
+    DeviceManager::load_filaments_blacklist_config();
 
     // remove old log files over LOG_FILES_MAX_NUM
     std::string log_addr = data_dir();