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python/README_win.md

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+Windows Native Python Build Instructions
+========================================
+
+This project uses pybind11 to build Python .pyd extension modules on Windows.
+Because Windows installs multiple Python versions, and pybind11 currently only 
+supports up to Python 3.12, you must follow these steps exactly.
+
+Requirements
+------------
+- Visual Studio Developer Command Prompt (VS C++ Build Tools installed)
+- Python 3.12 (pybind11 does NOT support 3.13+ at the time of writing)
+- pybind11 installed into Python 3.12
+
+Check installed Python versions:
+    py -0
+
+If Python 3.12 is missing:
+    winget install Python.Python.3.12
+
+Install pybind11 for Python 3.12:
+    py -3.12 -m pip install pybind11
+
+IMPORTANT:
+You must build AND run with the same Python interpreter version (3.12).
+
+Building the .pyd Modules
+-------------------------
+Open the "Developer Command Prompt for Visual Studio".
+
+From the project root:
+
+    mkdir build_python_win
+    cd build_python_win
+
+Run CMake using the exact path to python.exe for Python 3.12:
+
+    cmake -G "Visual Studio 17 2022" -A x64 -DBASISU_BUILD_PYTHON=ON -DBASISU_BUILD_WASM=OFF -DPYTHON_EXECUTABLE="C:\Users\<YOU>\AppData\Local\Programs\Python\Python312\python.exe" ..
+
+Build:
+
+    cmake --build . --config Release
+
+Output files will be created in:
+
+    python/basisu_py/basisu_python.pyd
+    python/basisu_py/basisu_transcoder_python.pyd
+
+Running the Modules
+-------------------
+Always run using Python 3.12:
+
+    py -3.12
+
+Inside Python:
+
+    import basisu_py
+    print("Modules loaded OK.")
+	
+While in the "python" directory:
+
+     py -m tests.test_backend_loading
+
+WASM Backend (Optional)
+-----------------------
+Install wasmtime:
+
+    py -3.12 -m pip install wasmtime
+
+Ensure these files exist:
+
+    python/basisu_py/wasm/*.wasm
+
+Common Problems
+---------------
+1. "pybind11 not found"
+   -> Installed into wrong Python version. Use:
+        py -3.12 -m pip install pybind11
+
+2. "Python config failure"
+   -> You are using Python 3.13 or 3.14. Must use Python 3.12.
+
+3. Modules not loading
+   -> You must run them with the same interpreter used to build them:
+        py -3.12
+