diff --git a/include/nana/gui/detail/general_events.hpp b/include/nana/gui/detail/general_events.hpp
index 9a9496e2..e912d7b5 100644
--- a/include/nana/gui/detail/general_events.hpp
+++ b/include/nana/gui/detail/general_events.hpp
@@ -1,7 +1,7 @@
 /**
 *	Definition of General Events
 *	Nana C++ Library(http://www.nanapro.org)
-*	Copyright(C) 2003-2018 Jinhao(cnjinhao@hotmail.com)
+*	Copyright(C) 2003-2019 Jinhao(cnjinhao@hotmail.com)
 *
 *	Distributed under the Boost Software License, Version 1.0.
 *	(See accompanying file LICENSE_1_0.txt or copy at
@@ -17,6 +17,7 @@
 #include <nana/gui/basis.hpp>
 #include "event_code.hpp"
 #include "internal_scope_guard.hpp"
+#include "../../filesystem/filesystem.hpp"
 #include <type_traits>
 #include <functional>
 #include <vector>
@@ -470,9 +471,9 @@ namespace nana
 
 	struct arg_dropfiles : public event_arg  
 	{
-		::nana::window	window_handle;	    ///<  A handle to the event window
-		::nana::point	pos;	            ///<  cursor position in the event window
-		std::vector<std::string>	files;	///<  external filenames
+		::nana::window	window_handle;				///<  A handle to the event window
+		::nana::point	pos;						///<  cursor position in the event window
+		std::vector<std::filesystem::path>	files;	///<  external filenames
 	};
 
 	struct arg_expose : public event_arg
diff --git a/source/detail/platform_spec_posix.cpp b/source/detail/platform_spec_posix.cpp
index bca68ea8..f7cbc9d6 100644
--- a/source/detail/platform_spec_posix.cpp
+++ b/source/detail/platform_spec_posix.cpp
@@ -1238,7 +1238,7 @@ namespace detail
 															0, AnyPropertyType, &type, &format, &len,
 															&dummy_bytes_left, &data))
 						{
-							auto files = new std::vector<std::string>;
+							auto files = new std::vector<std::filesystem::path>;
 							std::stringstream ss(reinterpret_cast<char*>(data));
 
 							while(true)
@@ -1258,7 +1258,7 @@ namespace detail
 										break;
 								}
 
-								files->push_back(file);
+								files->emplace_back(file);
 							}
 
 							if(files->size())
diff --git a/source/detail/posix/msg_packet.hpp b/source/detail/posix/msg_packet.hpp
index 6a36f129..df7a4bcf 100644
--- a/source/detail/posix/msg_packet.hpp
+++ b/source/detail/posix/msg_packet.hpp
@@ -3,6 +3,7 @@
 #include <X11/Xlib.h>
 #include <vector>
 #include <nana/deploy.hpp>
+#include <nana/filesystem/filesystem.hpp>
 
 namespace nana
 {
@@ -29,7 +30,7 @@ namespace detail
 				Window window;
 				int x;
 				int y;
-				std::vector<std::string> * files;
+				std::vector<std::filesystem::path> * files;
 			}mouse_drop;
 		}u;
 	};
diff --git a/source/gui/detail/bedrock_windows.cpp b/source/gui/detail/bedrock_windows.cpp
index 30a05fb5..bd02a00d 100644
--- a/source/gui/detail/bedrock_windows.cpp
+++ b/source/gui/detail/bedrock_windows.cpp
@@ -1149,10 +1149,10 @@ namespace detail
 						std::unique_ptr<wchar_t[]> varbuf;
 						std::size_t bufsize = 0;
 
-						unsigned size = ::DragQueryFile(drop, 0xFFFFFFFF, 0, 0);
+						unsigned size = ::DragQueryFile(drop, 0xFFFFFFFF, nullptr, 0);
 						for(unsigned i = 0; i < size; ++i)
 						{
-							unsigned reqlen = ::DragQueryFile(drop, i, 0, 0) + 1;
+							unsigned reqlen = ::DragQueryFile(drop, i, nullptr, 0) + 1;
 							if(bufsize < reqlen)
 							{
 								varbuf.reset(new wchar_t[reqlen]);
@@ -1160,8 +1160,7 @@ namespace detail
 							}
 
 							::DragQueryFile(drop, i, varbuf.get(), reqlen);
-
-							dropfiles.files.emplace_back(to_utf8(varbuf.get()));
+							dropfiles.files.emplace_back(varbuf.get());
 						}
 
 						while(msgwnd && (msgwnd->flags.dropable == false))