diff --git a/src/libipc/platform/to_tchar.h b/src/libipc/platform/to_tchar.h
index d9a1fb6..3cc2840 100755
--- a/src/libipc/platform/to_tchar.h
+++ b/src/libipc/platform/to_tchar.h
@@ -52,51 +52,21 @@ auto to_tchar(ipc::string &&external) -> IsSameChar<T, ipc::wstring> {
     if (external.empty()) {
         return {}; // noconv
     }
-#if 0 // backup
-    auto &fcodecvt = std::use_facet<std::codecvt<wchar_t, char, std::mbstate_t>>(std::locale());
-    std::mbstate_t mb {};
-    ipc::wstring internal(external.size(), '\0');
-    char const *first = &external[0], *last = &external[external.size()];
-    std::size_t len   = 0;
-    while (first != last) {
-        wchar_t *start = &internal[len], *end = &internal[internal.size()], *to_next;
-        auto ret = fcodecvt.in(mb, first, last, first,
-                                   start, end , to_next);
-        switch (ret) {
-        // no conversion, just copy code values
-        case std::codecvt_base::noconv:
-            internal.resize(len);
-            for (; first != last; ++first) {
-                internal.push_back((wchar_t)(unsigned char)*first);
-            }
-            break;
-        // conversion completed
-        case std::codecvt_base::ok:
-            len += static_cast<size_t>(to_next - start);
-            internal.resize(len);
-            break;
-        // not enough space in the output buffer or unexpected end of source buffer
-        case std::codecvt_base::partial:
-            if (to_next <= start) {
-                throw std::range_error{"[to_tchar] bad conversion"};
-            }
-            len += static_cast<size_t>(to_next - start);
-            internal.resize(internal.size() + external.size());
-            break;
-        // encountered a character that could not be converted
-        default: // error
-            throw std::range_error{"[to_tchar] bad conversion"};
-        }
-    }
-#else
-    // CP_ACP: The system default Windows ANSI code page.
-    int size_needed = ::MultiByteToWideChar(CP_ACP, 0, &external[0], (int)external.size(), NULL, 0);
+    /**
+     * CP_ACP       : The system default Windows ANSI code page.
+     * CP_MACCP     : The current system Macintosh code page.
+     * CP_OEMCP     : The current system OEM code page.
+     * CP_SYMBOL    : Symbol code page (42).
+     * CP_THREAD_ACP: The Windows ANSI code page for the current thread.
+     * CP_UTF7      : UTF-7. Use this value only when forced by a 7-bit transport mechanism. Use of UTF-8 is preferred.
+     * CP_UTF8      : UTF-8.
+    */
+    int size_needed = ::MultiByteToWideChar(CP_UTF8, 0, &external[0], (int)external.size(), NULL, 0);
     if (size_needed <= 0) {
         return {};
     }
     ipc::wstring internal(size_needed, L'\0');
-    ::MultiByteToWideChar(CP_ACP, 0, &external[0], (int)external.size(), &internal[0], size_needed);
-#endif
+    ::MultiByteToWideChar(CP_UTF8, 0, &external[0], (int)external.size(), &internal[0], size_needed);
     return internal;
 }
 
diff --git a/test/test_platform.cpp b/test/test_platform.cpp
index 4cbff16..c368690 100644
--- a/test/test_platform.cpp
+++ b/test/test_platform.cpp
@@ -1,4 +1,3 @@
-
 #if defined(WIN64) || defined(_WIN64) || defined(__WIN64__) || \
     defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__NT__) || \
     defined(WINCE) || defined(_WIN32_WCE)
@@ -11,18 +10,21 @@
 #include "libipc/platform/to_tchar.h"
 
 TEST(Platform, to_tchar) {
-    char    const *utf8 =  "hello world, 你好，こんにちは";
-    wchar_t const *wstr = L"hello world, 你好，こんにちは";
+    char const utf8[] = {
+        0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x77, 0x6f, 0x72, 0x6c, 0x64, 0x2c, 0x20, 0xe6, 0xb5, 0xa3,
+        0xe7, 0x8a, 0xb2, 0xe3, 0x82, 0xbd, 0xe9, 0x94, 0x9b, 0xe5, 0xb1, 0xbb, 0xe4, 0xba, 0xbe, 0xe9,
+        0x8a, 0x88, 0xe6, 0x92, 0xb1, 0xe4, 0xbc, 0x80, 0xe9, 0x8a, 0x87, 0xc2, 0xb0, 0xe4, 0xbc, 0x85,
+        0x00,
+    };
+    wchar_t const wstr[] = L"hello world, 你好，こんにちは";
     {
         ipc::string str = ipc::detail::to_tchar<char>(utf8);
         EXPECT_STREQ(str.c_str(), utf8);
     }
     {
         ipc::wstring wtr = ipc::detail::to_tchar<wchar_t>(utf8);
-        //std::wcout.imbue(std::locale());
-        //std::wcout << wtr << "\n";
         EXPECT_STREQ(wtr.c_str(), wstr);
     }
 }
 
-#endif/*WIN*/
+#endif/*WIN*/
\ No newline at end of file