diff --git a/src/common/file_util.cpp b/src/common/file_util.cpp
index 17af7c385..751d17d96 100644
--- a/src/common/file_util.cpp
+++ b/src/common/file_util.cpp
@@ -9,6 +9,7 @@
 #include "common/logging/log.h"
 
 #ifdef _WIN32
+    #include <share.h>
     #include <windows.h>
     #include <shlobj.h> // for SHGetFolderPath
     #include <shellapi.h>
@@ -927,7 +928,11 @@ bool IOFile::Open(const std::string& filename, const char openmode[])
 {
     Close();
 #ifdef _WIN32
+#if defined(__MINGW64__)
+    m_file = _wfsopen(Common::UTF8ToUTF16W(filename).c_str(), Common::UTF8ToUTF16W(openmode).c_str(),SH_DENYNO);
+#else
     _wfopen_s(&m_file, Common::UTF8ToUTF16W(filename).c_str(), Common::UTF8ToUTF16W(openmode).c_str());
+#endif
 #else
     m_file = fopen(filename.c_str(), openmode);
 #endif
@@ -980,10 +985,16 @@ bool IOFile::Flush()
 bool IOFile::Resize(u64 size)
 {
     if (!IsOpen() || 0 !=
+
 #ifdef _WIN32
+#if defined(__MINGW64__)
+        //TDM-GCC64 does not supports _chsize_s ?in <io_s.h>
+        _chsize(_fileno(m_file), size)
+#else
         // ector: _chsize sucks, not 64-bit safe
         // F|RES: changed to _chsize_s. i think it is 64-bit safe
         _chsize_s(_fileno(m_file), size)
+#endif
 #else
         // TODO: handle 64bit and growing
         ftruncate(fileno(m_file), size)
diff --git a/src/common/string_util.cpp b/src/common/string_util.cpp
index f0aa072db..4cd7cd44a 100644
--- a/src/common/string_util.cpp
+++ b/src/common/string_util.cpp
@@ -13,7 +13,7 @@
 #include "common/logging/log.h"
 #include "common/string_util.h"
 
-#ifdef _MSC_VER
+#if defined(_MSC_VER) || __MINGW64__
     #include <Windows.h>
     #include <codecvt>
     #include "common/common_funcs.h"
@@ -52,7 +52,7 @@ bool CharArrayFromFormatV(char* out, int outsize, const char* format, va_list ar
 {
     int writtenCount;
 
-#ifdef _MSC_VER
+#if defined(_MSC_VER) || !defined(__MINGW64__)
     // You would think *printf are simple, right? Iterate on each character,
     // if it's a format specifier handle it properly, etc.
     //
@@ -292,11 +292,11 @@ std::string ReplaceAll(std::string result, const std::string& src, const std::st
     return result;
 }
 
-#ifdef _MSC_VER
+#if defined(_MSC_VER) || !__MINGW32__ || __MINGW64__
 
 std::string UTF16ToUTF8(const std::u16string& input)
 {
-#if _MSC_VER >= 1900
+#if _MSC_VER >= 1900 && defined(__MINGW64__)
     // Workaround for missing char16_t/char32_t instantiations in MSVC2015
     std::wstring_convert<std::codecvt_utf8_utf16<__int16>, __int16> convert;
     std::basic_string<__int16> tmp_buffer(input.cbegin(), input.cend());
@@ -309,7 +309,7 @@ std::string UTF16ToUTF8(const std::u16string& input)
 
 std::u16string UTF8ToUTF16(const std::string& input)
 {
-#if _MSC_VER >= 1900
+#if _MSC_VER >= 1900 && defined(__MINGW64__)
     // Workaround for missing char16_t/char32_t instantiations in MSVC2015
     std::wstring_convert<std::codecvt_utf8_utf16<__int16>, __int16> convert;
     auto tmp_buffer = convert.from_bytes(input);
@@ -323,13 +323,11 @@ std::u16string UTF8ToUTF16(const std::string& input)
 static std::wstring CPToUTF16(u32 code_page, const std::string& input)
 {
     auto const size = MultiByteToWideChar(code_page, 0, input.data(), static_cast<int>(input.size()), nullptr, 0);
-
-    std::wstring output;
+    std::wstring output(size,'\0');
     output.resize(size);
 
     if (size == 0 || size != MultiByteToWideChar(code_page, 0, input.data(), static_cast<int>(input.size()), &output[0], static_cast<int>(output.size())))
         output.clear();
-
     return output;
 }
 
diff --git a/src/core/gdbstub/gdbstub.cpp b/src/core/gdbstub/gdbstub.cpp
index 28d403158..b62aba24e 100644
--- a/src/core/gdbstub/gdbstub.cpp
+++ b/src/core/gdbstub/gdbstub.cpp
@@ -14,7 +14,7 @@
 #include <map>
 #include <numeric>
 
-#ifdef _MSC_VER
+#if defined(_MSC_VER) || (__MINGW64__)
 #include <WinSock2.h>
 #include <ws2tcpip.h>
 #include <common/x64/abi.h>