diff --git a/build-uwp-native.sh b/build-uwp-native.sh
new file mode 100755
index 0000000..8d156e8
--- /dev/null
+++ b/build-uwp-native.sh
@@ -0,0 +1,103 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+usage() {
+    cat <<'EOF'
+Usage: ./build-uwp-native.sh [x64|x86] [Debug|Release]
+
+Builds the UWP/WinRT native DLL with MinGW, then stages:
+  - SDL2.dll into uwp/deps/bin
+  - libarmsx.dll, SDL2.dll, and icons/ into uwp/ARMSX/bin/<platform>/<config>
+
+Environment overrides:
+  BUILD_JOBS   Parallel build jobs (default: 4)
+  SDL2_DIR     Override the SDL2 package path relative to repo root
+  MINGW_MAKE   Override the make command (default: mingw32-make, fallback: make)
+EOF
+}
+
+platform="${1:-x64}"
+configuration="${2:-Debug}"
+build_jobs="${BUILD_JOBS:-4}"
+
+case "$platform" in
+    x64)
+        default_sdl2_dir="SDL2-2.30.3/x86_64-w64-mingw32"
+        ;;
+    x86)
+        default_sdl2_dir="SDL2-2.30.3/i686-w64-mingw32"
+        ;;
+    -h|--help)
+        usage
+        exit 0
+        ;;
+    *)
+        echo "Unsupported platform '$platform'. Use x64 or x86." >&2
+        exit 1
+        ;;
+esac
+
+case "$configuration" in
+    Debug|Release)
+        ;;
+    *)
+        echo "Unsupported configuration '$configuration'. Use Debug or Release." >&2
+        exit 1
+        ;;
+esac
+
+repo_root="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+sdl2_dir="${SDL2_DIR:-$default_sdl2_dir}"
+sdl2_root="$repo_root/$sdl2_dir"
+sdl2_include="$sdl2_root/include/SDL2"
+sdl2_lib="$sdl2_root/lib"
+sdl2_dll="$sdl2_root/bin/SDL2.dll"
+fsui_build_dir="$repo_root/build/fsui/uwp-$platform"
+native_stage_dir="$repo_root/uwp/deps/bin"
+uwp_output_dir="$repo_root/uwp/ARMSX/bin/$platform/$configuration"
+uwp_icons_dir="$uwp_output_dir/icons"
+
+make_cmd="${MINGW_MAKE:-mingw32-make}"
+if ! command -v "$make_cmd" >/dev/null 2>&1; then
+    make_cmd="make"
+fi
+if ! command -v "$make_cmd" >/dev/null 2>&1; then
+    echo "Unable to find mingw32-make or make in PATH." >&2
+    exit 1
+fi
+
+if ! command -v cmake >/dev/null 2>&1; then
+    echo "cmake is required." >&2
+    exit 1
+fi
+
+if [ ! -d "$sdl2_root" ]; then
+    echo "SDL2 dependency directory not found at $sdl2_root" >&2
+    exit 1
+fi
+
+mkdir -p "$repo_root/bin" "$native_stage_dir" "$uwp_output_dir" "$uwp_icons_dir"
+
+cmake -S "$repo_root/third_party/fsui-lib" -B "$fsui_build_dir" -G "MinGW Makefiles" \
+    -DFSUI_BUILD_SAMPLES=OFF \
+    -DFSUI_PLATFORM_BACKEND=SDL2 \
+    -DFSUI_USE_SYSTEM_SDL2=ON \
+    -DCMAKE_PREFIX_PATH="$sdl2_root"
+cmake --build "$fsui_build_dir" -j"$build_jobs"
+
+"$make_cmd" clean
+"$make_cmd" shared \
+    WINDOWS_TARGET=1 \
+    UWP_TARGET=1 \
+    SDL_STATIC=0 \
+    FSUI_BUILD_DIR="$fsui_build_dir" \
+    SDL_CFLAGS="-I$sdl2_include" \
+    SDL_LIBS_DYNAMIC="-L$sdl2_lib -lSDL2"
+
+cp "$sdl2_dll" "$native_stage_dir/"
+cp "$repo_root/bin/libarmsx.dll" "$uwp_output_dir/"
+cp "$sdl2_dll" "$uwp_output_dir/"
+cp -R "$repo_root/icons/." "$uwp_icons_dir/"
+
+echo "Staged UWP native runtime to $uwp_output_dir"