diff --git a/include/nana/filesystem/filesystem.hpp b/include/nana/filesystem/filesystem.hpp
index d5c0a7d9..520cdf1c 100644
--- a/include/nana/filesystem/filesystem.hpp
+++ b/include/nana/filesystem/filesystem.hpp
@@ -234,7 +234,7 @@ namespace nana  { namespace experimental { namespace filesystem
 		}
 
 		// modifiers
-		//void clear() noexcept;
+		void clear() noexcept;
 		path& make_preferred();
 		path& remove_filename();
 		//path& replace_filename(const path& replacement);
@@ -242,10 +242,10 @@ namespace nana  { namespace experimental { namespace filesystem
 		//void swap(path& rhs) noexcept;
 
 		// decomposition
-		//path root_name() const;
-		//path root_directory() const;
-		//path root_path() const;
-		//path relative_path() const;
+		path root_name() const;
+		path root_directory() const;
+		path root_path() const;
+		path relative_path() const;
 		path parent_path() const;
 		path filename() const;
 		//path stem() const;
@@ -253,16 +253,16 @@ namespace nana  { namespace experimental { namespace filesystem
 
 		// query
 		bool empty() const noexcept;
-		//bool has_root_name() const;
-		//bool has_root_directory() const;
-		//bool has_root_path() const;
-		//bool has_relative_path() const;
-		bool has_parent_path() const { return !parent_path().string().empty(); };   // temp;;
-		bool has_filename() const    { return !filename().string().empty(); };   // temp;
+		bool has_root_name() const { return !root_name().empty();  }
+		bool has_root_directory() const { return !root_directory().empty();  }
+		bool has_root_path() const { return !root_path().empty();  }
+		bool has_relative_path() const { return !relative_path().empty(); }
+		bool has_parent_path() const { return !parent_path().empty(); };   // temp;;
+		bool has_filename() const    { return !filename().empty(); };   // temp;
 		//bool has_stem() const;
-		bool has_extension() const   { return !extension().string().empty(); };   // temp
-		//bool is_absolute() const;
-		//bool is_relative() const;
+		bool has_extension() const   { return !extension().empty(); };   // temp
+		bool is_absolute() const;
+		bool is_relative() const;
 
 		int compare(const path& other) const;
 
@@ -523,11 +523,20 @@ namespace std {
 #       else
 			using namespace nana::experimental::filesystem::v1;
 #       endif
+
 		} // filesystem
 	} // experimental
 
 	namespace filesystem {
 		using namespace std::experimental::filesystem;
+
+#if (defined(_MSC_VER) && ((!defined(_MSVC_LANG)) || (_MSVC_LANG < 201703)))
+		path absolute(const path& p);
+		path absolute(const path& p, std::error_code& err);
+
+		path canonical(const path& p);
+		path canonical(const path& p, std::error_code& err);
+#endif
 	}
 } // std
 
diff --git a/include/nana/filesystem/filesystem_ext.hpp b/include/nana/filesystem/filesystem_ext.hpp
index ca579e8e..7bc69f0c 100644
--- a/include/nana/filesystem/filesystem_ext.hpp
+++ b/include/nana/filesystem/filesystem_ext.hpp
@@ -33,10 +33,10 @@ namespace filesystem_ext
     constexpr auto const def_rootname = "Root/";
 #endif
 
-std::experimental::filesystem::path path_user();    ///< extention ?
+std::filesystem::path path_user();    ///< extention ?
 
 													/// workaround Boost not having path.generic_u8string() - a good point for http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0251r0.pdf
-inline std::string generic_u8string(const std::experimental::filesystem::path& p)
+inline std::string generic_u8string(const std::filesystem::path& p)
 {
 #if NANA_USING_BOOST_FILESYSTEM
 	return nana::to_utf8(p.generic_wstring());
@@ -45,15 +45,15 @@ inline std::string generic_u8string(const std::experimental::filesystem::path& p
 #endif
 }
 
-inline bool is_directory(const std::experimental::filesystem::directory_entry& dir) noexcept
+inline bool is_directory(const std::filesystem::directory_entry& dir) noexcept
 {
     return is_directory(dir.status());
 }
 
 //template<class DI> // DI = directory_iterator from std, boost, or nana : return directory_entry
-class directory_only_iterator : public std::experimental::filesystem::directory_iterator
+class directory_only_iterator : public std::filesystem::directory_iterator
 {
-	using directory_iterator = std::experimental::filesystem::directory_iterator;
+	using directory_iterator = std::filesystem::directory_iterator;
 
 	directory_only_iterator& find_first()
 	{
@@ -93,9 +93,9 @@ inline directory_only_iterator end(const directory_only_iterator&) noexcept
 }
 
 //template<class DI> // DI = directory_iterator from std, boost, or nana : value_type directory_entry
-class regular_file_only_iterator : public std::experimental::filesystem::directory_iterator
+class regular_file_only_iterator : public std::filesystem::directory_iterator
 {
-	using directory_iterator = std::experimental::filesystem::directory_iterator;
+	using directory_iterator = std::filesystem::directory_iterator;
 	regular_file_only_iterator& find_first()
 	{
 		while (((*this) != directory_iterator{}) && !is_regular_file((**this).status()))
@@ -128,11 +128,11 @@ inline regular_file_only_iterator end(const regular_file_only_iterator&) noexcep
 	return{};
 }
 
-std::string pretty_file_size(const std::experimental::filesystem::path& path);
+std::string pretty_file_size(const std::filesystem::path& path);
 
-std::string pretty_file_date(const std::experimental::filesystem::path& path);
+std::string pretty_file_date(const std::filesystem::path& path);
 
-bool modified_file_time(const std::experimental::filesystem::path& p, struct tm&);    ///< extention ?
+bool modified_file_time(const std::filesystem::path& p, struct tm&);    ///< extention ?
 
 }  // filesystem_ext
 }  // nana
diff --git a/include/nana/gui/filebox.hpp b/include/nana/gui/filebox.hpp
index 812770ee..d157e336 100644
--- a/include/nana/gui/filebox.hpp
+++ b/include/nana/gui/filebox.hpp
@@ -92,7 +92,7 @@ namespace nana
 		folderbox(folderbox&&) = delete;
 		folderbox& operator=(folderbox&&) = delete;
 	public:
-		using path_type = std::experimental::filesystem::path;
+		using path_type = std::filesystem::path;
 
 		explicit folderbox(window owner = nullptr, const path_type& init_path = {}, std::string title={});
 		~folderbox();
diff --git a/source/filesystem/filesystem.cpp b/source/filesystem/filesystem.cpp
index ee636f18..bb83039c 100644
--- a/source/filesystem/filesystem.cpp
+++ b/source/filesystem/filesystem.cpp
@@ -45,7 +45,7 @@
 	#include <stdlib.h>
 #endif
 
-namespace fs = std::experimental::filesystem;
+namespace fs = std::filesystem;
 
 namespace nana
 {
@@ -117,12 +117,7 @@ namespace nana
 
 				if (ftime == ((fs::file_time_type::min)())) return{};
 
-				//std::time_t cftime = decltype(ftime)::clock::to_time_t(ftime);
-
-				//A workaround for VC2013
-				using time_point = decltype(ftime);
-
-				auto cftime = time_point::clock::to_time_t(ftime);
+				auto cftime = static_cast<std::time_t>(ftime.time_since_epoch().count());
 
 				std::stringstream tm;
 				tm << std::put_time(std::localtime(&cftime), "%Y-%m-%d, %H:%M:%S");
@@ -209,9 +204,9 @@ namespace nana {	namespace experimental {	namespace filesystem
 
 		//Because of No wide character version of POSIX
 #if defined(NANA_POSIX)
-		const char* splstr = "/";
+		const char* separators = "/";
 #else
-		const wchar_t* splstr = L"/\\";
+		const wchar_t* separators = L"/\\";
 #endif
 
 	//class file_status
@@ -249,13 +244,22 @@ namespace nana {	namespace experimental {	namespace filesystem
 		/// true if the path is empty, false otherwise. ??
 		bool path::empty() const noexcept
 		{
-#if defined(NANA_WINDOWS)
-			return (::GetFileAttributes(pathstr_.c_str()) == INVALID_FILE_ATTRIBUTES);
-#elif defined(NANA_POSIX)
-			struct stat sta;
-			return (::stat(pathstr_.c_str(), &sta) == -1);
+			return pathstr_.empty();
+		}
+
+		bool path::is_absolute() const
+		{
+#ifdef NANA_WINDOWS
+			return has_root_name() && has_root_directory();
+#else
+			return has_root_directory();
 #endif
 		}
+		
+		bool path::is_relative() const
+		{
+			return !is_absolute();
+		}
 
 		path path::extension() const
 		{
@@ -277,6 +281,107 @@ namespace nana {	namespace experimental {	namespace filesystem
 			return path(pathstr_.substr(pos));
 		}
 
+		bool is_directory_separator(path::value_type ch)
+		{
+			return (ch == '/')
+#ifdef NANA_WINDOWS
+				|| (ch == path::preferred_separator)
+#endif
+				;
+		}
+
+		
+
+		path path::root_name() const
+		{
+			auto pos = pathstr_.find_first_not_of(separators);
+			if (pathstr_.npos != pos)
+			{
+				pos = pathstr_.find_first_of(separators, pos + 1);
+				if (pathstr_.npos != pos)
+				{
+					if ((is_directory_separator(pathstr_[0]) && is_directory_separator(pathstr_[1]))
+#ifdef NANA_WINDOWS
+						|| (pathstr_[pos - 1] == ':')
+#endif
+						)
+						return pathstr_.substr(0, pos);
+				}
+			}
+
+			return path{};
+		}
+
+		std::size_t root_directory_pos(const path::string_type& str)
+		{
+#ifdef NANA_WINDOWS
+			// case "c:/"
+			if (str.size() > 2
+				&& str[1] == ':'
+				&& is_directory_separator(str[2])) return 2;
+#endif
+
+			// case "//"
+			if (str.size() == 2
+				&& is_directory_separator(str[0])
+				&& is_directory_separator(str[1])) return path::string_type::npos;
+
+#ifdef NANA_WINDOWS
+			// case "\\?\"
+			if (str.size() > 4
+				&& is_directory_separator(str[0])
+				&& is_directory_separator(str[1])
+				&& str[2] == '?'
+				&& is_directory_separator(str[3]))
+			{
+				auto pos = str.find_first_of(separators, 4);
+				return pos < str.size() ? pos : str.npos;
+			}
+#endif
+
+			// case "//net {/}"
+			if (str.size() > 3
+				&& is_directory_separator(str[0])
+				&& is_directory_separator(str[1])
+				&& !is_directory_separator(str[2]))
+			{
+				auto pos = str.find_first_of(separators, 2);
+				return pos < str.size() ? pos : str.npos;
+			}
+
+			// case "/"
+			if (str.size() > 0 && is_directory_separator(str[0])) return 0;
+
+			return str.npos;
+		}
+
+		path path::root_directory() const
+		{
+			auto pos = root_directory_pos(pathstr_);
+
+			return pos == string_type::npos
+				? path()
+				: path(pathstr_.substr(pos, 1));
+		}
+
+		path path::root_path() const
+		{
+			return root_name().pathstr_ + root_directory().pathstr_;
+		}
+
+		path path::relative_path() const
+		{
+			if (!empty())
+			{
+				auto pos = root_directory_pos(pathstr_);
+
+				pos = pathstr_.find_first_not_of(separators, pos);
+				if (pathstr_.npos != pos)
+					return path{ pathstr_.substr(pos) };
+			}
+			return{};
+		}
+
 		path path::parent_path() const
 		{
 			return{nana_fs::parent_path(pathstr_)};
@@ -310,14 +415,14 @@ namespace nana {	namespace experimental {	namespace filesystem
 
 		path path::filename() const
 		{
-			auto pos = pathstr_.find_last_of(splstr);
+			auto pos = pathstr_.find_last_of(separators);
 			if (pos != pathstr_.npos)
 			{
 				if (pos + 1 == pathstr_.size())
 				{
 					value_type tmp[2] = {preferred_separator, 0};
 
-					if (pathstr_.npos != pathstr_.find_last_not_of(splstr, pos))
+					if (pathstr_.npos != pathstr_.find_last_not_of(separators, pos))
 						tmp[0] = '.';
 
 					return{ tmp };
@@ -328,6 +433,19 @@ namespace nana {	namespace experimental {	namespace filesystem
 			return{ pathstr_ };
 		}
 
+		void path::clear() noexcept
+		{
+			pathstr_.clear();
+		}
+
+		path& path::make_preferred()
+		{
+#ifdef NANA_WINDOWS
+			std::replace(pathstr_.begin(), pathstr_.end(), L'/', L'\\');
+#endif
+			return *this;
+		}
+
 		path& path::remove_filename()
 		{
 #ifdef NANA_WINDOWS
@@ -418,10 +536,10 @@ namespace nana {	namespace experimental {	namespace filesystem
 			if (this == &p)
 			{
 				auto other = p.pathstr_;
-				if ((other.front() != '/') && (other.front() == path::preferred_separator))
+				if (!is_directory_separator(other.front()))
 				{
-					if (!this->pathstr_.empty() && (pathstr_.back() != '/' && pathstr_.back() == path::preferred_separator))
-						pathstr_.append(path::preferred_separator, 1);
+					if (!pathstr_.empty() && !is_directory_separator(pathstr_.back()))
+						pathstr_.append(1, path::preferred_separator);
 				}
 
 				pathstr_ += other;
@@ -429,10 +547,10 @@ namespace nana {	namespace experimental {	namespace filesystem
 			else
 			{
 				auto & other = p.pathstr_;
-				if ((other.front() != '/') && (other.front() == path::preferred_separator))
+				if (!is_directory_separator(other.front()))
 				{
-					if (!this->pathstr_.empty() && (pathstr_.back() != '/' && pathstr_.back() == path::preferred_separator))
-						pathstr_.append(path::preferred_separator, 1);
+					if (!pathstr_.empty() && !is_directory_separator(pathstr_.back()))
+						pathstr_.append(1, path::preferred_separator);
 				}
 
 				pathstr_ += p.pathstr_;
@@ -976,5 +1094,123 @@ namespace nana {	namespace experimental {	namespace filesystem
 		}//end namespace filesystem
 	} //end namespace experimental
 }//end namespace nana
+
+#if (defined(_MSC_VER) && ((!defined(_MSVC_LANG)) || (_MSVC_LANG < 201703)))
+namespace std
+{
+	namespace filesystem
+	{
+		path absolute(const path& p)
+		{
+			if (p.empty())
+				return p;
+
+			auto abs_base = current_path();
+
+			//  store expensive to compute values that are needed multiple times
+			path p_root_name(p.root_name());
+			path base_root_name(abs_base.root_name());
+			path p_root_directory(p.root_directory());
+
+			if (!p_root_name.empty())  // p.has_root_name()
+			{
+				if (p_root_directory.empty())  // !p.has_root_directory()
+					return p_root_name / abs_base.root_directory()
+					/ abs_base.relative_path() / p.relative_path();
+				// p is absolute, so fall through to return p at end of block
+			}
+			else if (!p_root_directory.empty())  // p.has_root_directory()
+			{
+#ifdef NANA_POSIX
+				// POSIX can have root name it it is a network path
+				if (base_root_name.empty())   // !abs_base.has_root_name()
+					return p;
+#endif
+				return base_root_name / p;
+			}
+			else
+				return abs_base / p;
+
+			return p;  // p.is_absolute() is true
+		}
+
+		path absolute(const path& p, std::error_code& err)
+		{
+			return absolute(p);
+		}
+
+		path canonical(const path& p, std::error_code* err)
+		{
+			path source(p.is_absolute() ? p : absolute(p));
+			path root(source.root_path());
+			path result;
+
+			std::error_code local_ec;
+			file_status stat(status(source, local_ec));
+
+			if (stat.type() == file_type::not_found)
+			{
+				if (nullptr == err)
+					throw (filesystem_error(
+					"nana::filesystem::canonical", source,
+					error_code(static_cast<int>(errc::no_such_file_or_directory), generic_category())));
+				err->assign(static_cast<int>(errc::no_such_file_or_directory), generic_category());
+				return result;
+			}
+			else if (local_ec)
+			{
+				if (nullptr == err)
+					throw (filesystem_error(
+					"nana::filesystem::canonical", source, local_ec));
+				*err = local_ec;
+				return result;
+			}
+
+
+			auto tmp_p = source;
+
+			std::vector<path> source_elements;
+			while (tmp_p != root)
+			{
+				source_elements.emplace(source_elements.begin(), tmp_p.filename());
+				tmp_p.remove_filename();
+			}
+
+			result = root;
+
+			for(auto & e : source_elements)
+			{
+				auto str = e.string();
+				if("." == str)
+					continue;
+				else if(".." == str)
+				{
+					if(result != root)
+						result.remove_filename();
+					continue;
+				}
+
+				result /= e;
+			}
+
+			if (err)
+				err->clear();
+
+			return result;
+		}
+
+		path canonical(const path& p)
+		{
+			return canonical(p, nullptr);
+		}
+
+		path canonical(const path& p, std::error_code& err)
+		{
+			return canonical(p, &err);
+		}
+	}//end namespace filesystem
+}//end namespace std
+#endif
+
 #endif
 
diff --git a/source/gui/filebox.cpp b/source/gui/filebox.cpp
index 36ff2ef9..3faaf2a1 100644
--- a/source/gui/filebox.cpp
+++ b/source/gui/filebox.cpp
@@ -37,7 +37,7 @@
 #	include <algorithm>
 #endif
 
-namespace fs = std::experimental::filesystem;
+namespace fs = std::filesystem;
 namespace fs_ext = nana::filesystem_ext;
 
 
@@ -1295,15 +1295,13 @@ namespace nana
 		std::wstring init_path = impl_->init_path.wstring();
 
 		// https://docs.microsoft.com/en-us/windows/desktop/api/shlobj_core/ns-shlobj_core-_browseinfoa
-        BROWSEINFO brw       = { 0 };
+		BROWSEINFO brw       = { 0 };
 		brw.hwndOwner        = reinterpret_cast<HWND>(API::root(impl_->owner));
-		//brw.pidlRoot;                      // specifies the location of the root folder from which to start browsing.
 		brw.pszDisplayName   = display_text; // buffer to receive the display name of the folder selected by the user.
 		brw.lpszTitle        = title.data();
 		brw.ulFlags          = BIF_RETURNONLYFSDIRS | BIF_NEWDIALOGSTYLE; // | BIF_EDITBOX;
 		brw.lpfn             = browse_folder_callback;
 		brw.lParam           = reinterpret_cast<LPARAM>(init_path.c_str());
-		//brw.iImage;                        //
 
 		auto pidl = ::SHBrowseForFolder(&brw);
 		if (pidl)
diff --git a/source/gui/widgets/listbox.cpp b/source/gui/widgets/listbox.cpp
index 09c62a06..eb302d9a 100644
--- a/source/gui/widgets/listbox.cpp
+++ b/source/gui/widgets/listbox.cpp
@@ -5996,7 +5996,7 @@ namespace nana
 
 		auto listbox::last_visible() const -> index_pair
 		{
-			return _m_ess().lister.advance(_m_ess().first_display(), _m_ess().count_of_exposed(true));
+			return _m_ess().lister.advance(_m_ess().first_display(), static_cast<int>(_m_ess().count_of_exposed(true)));
 		}
 
 		auto listbox::visibles() const -> index_pairs