diff --git a/.github/workflows/build-matrix.yml b/.github/workflows/build-matrix.yml
index dd6024b..ee63705 100644
--- a/.github/workflows/build-matrix.yml
+++ b/.github/workflows/build-matrix.yml
@@ -22,6 +22,15 @@ jobs:
             arch: x86_64
             test-bin-suffix: .md.exe
 
+          - identifier: windows-debug-mingw
+            os: windows-latest
+            name: 🏁 Windows Debug (MinGW)
+            target: template_debug
+            platform: windows
+            arch: x86_64
+            mingw: true
+            test-bin-suffix: .md.exe
+
           - identifier: windows-debug-replace
             os: windows-latest
             name: 🏁 Windows Debug (Replace Error UTF Compliance)
@@ -39,6 +48,15 @@ jobs:
             arch: x86_64
             test-bin-suffix: .md.exe
 
+          - identifier: windows-release-mingw
+            os: windows-latest
+            name: 🏁 Windows Release (MinGW)
+            target: template_release
+            platform: windows
+            arch: x86_64
+            mingw: true
+            test-bin-suffix: .md.exe
+
           - identifier: macos-debug
             os: macos-latest
             name: 🍎 macOS (universal) Debug
@@ -98,6 +116,10 @@ jobs:
           submodules: recursive
           persist-credentials: false
 
+      - name: Setup MinGW for Windows/MinGW build
+        if: matrix.platform == 'windows' && (matrix.mingw || false)
+        uses: egor-tensin/setup-mingw@ef0952fadae6794e225c0c1654887408bcadbf64
+
       - name: Build
         uses: ./.github/actions/openvic-dl-build
         with:
diff --git a/src/openvic-dataloader/detail/ConvertGbk.hpp b/src/openvic-dataloader/detail/ConvertGbk.hpp
index 8ddd9a2..cba9791 100644
--- a/src/openvic-dataloader/detail/ConvertGbk.hpp
+++ b/src/openvic-dataloader/detail/ConvertGbk.hpp
@@ -11,12 +11,14 @@
 #include <lexy/input/buffer.hpp>
 #include <lexy/input/file.hpp>
 
-#ifdef _WIN32
+#if __has_include(<iconv.h>)
+#include <iconv.h>
+#elif defined(_WIN32)
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 #undef WIN32_LEAN_AND_MEAN
-#elif defined(__unix__) || defined(__APPLE__) || __has_include(<iconv.h>)
-#include <iconv.h>
+#elif defined(__unix__) || defined(__APPLE__)
+#error "<iconv.h> not found on POSIX system"
 #endif
 
 namespace ovdl::convert::gbk {
@@ -42,7 +44,7 @@ namespace ovdl::convert::gbk {
 					default: break;
 				}
 
-#if defined(__unix__) || defined(__APPLE__) || __has_include(<iconv.h>)
+#if __has_include(<iconv.h>)
 				iconv_t cd = ::iconv_open("UTF-8", "WINDOWS-936");
 				if (cd == (iconv_t)-1) {
 					return lexy::buffer<Encoding, MemoryResource> { resource };
@@ -102,7 +104,7 @@ namespace ovdl::convert::gbk {
 					}
 					return false;
 				};
-#if defined(_WIN32)
+#if !__has_include(<iconv.h>) && defined(_WIN32)
 				auto iconv_mimic = [&]() -> int64_t {
 					static constexpr size_t CP_GBK = 936;
 					static constexpr size_t MB_CHAR_MAX = 16;
@@ -205,7 +207,7 @@ namespace ovdl::convert::gbk {
 						}
 					}
 				}
-#elif defined(__unix__) || defined(__APPLE__) || __has_include(<iconv.h>)
+#elif __has_include(<iconv.h>)
 				const auto end = in_buffer + size;
 				while (in_size > 0 && out_size > 0 && in_buffer != end) {
 					if (::iconv(cd, &in_buffer, &in_size, &out_buffer, &out_size) == -1) {