diff --git a/bitsandbytes_windows/cextension.py b/bitsandbytes_windows/cextension.py
deleted file mode 100644
index d38684a2..00000000
--- a/bitsandbytes_windows/cextension.py
+++ /dev/null
@@ -1,54 +0,0 @@
-import ctypes as ct
-from pathlib import Path
-from warnings import warn
-
-from .cuda_setup.main import evaluate_cuda_setup
-
-
-class CUDALibrary_Singleton(object):
-    _instance = None
-
-    def __init__(self):
-        raise RuntimeError("Call get_instance() instead")
-
-    def initialize(self):
-        binary_name = evaluate_cuda_setup()
-        package_dir = Path(__file__).parent
-        binary_path = package_dir / binary_name
-
-        if not binary_path.exists():
-            print(f"CUDA SETUP: TODO: compile library for specific version: {binary_name}")
-            legacy_binary_name = "libbitsandbytes.so"
-            print(f"CUDA SETUP: Defaulting to {legacy_binary_name}...")
-            binary_path = package_dir / legacy_binary_name
-            if not binary_path.exists():
-                print('CUDA SETUP: CUDA detection failed. Either CUDA driver not installed, CUDA not installed, or you have multiple conflicting CUDA libraries!')
-                print('CUDA SETUP: If you compiled from source, try again with `make CUDA_VERSION=DETECTED_CUDA_VERSION` for example, `make CUDA_VERSION=113`.')
-                raise Exception('CUDA SETUP: Setup Failed!')
-            # self.lib = ct.cdll.LoadLibrary(binary_path)
-            self.lib = ct.cdll.LoadLibrary(str(binary_path))            # $$$
-        else:
-            print(f"CUDA SETUP: Loading binary {binary_path}...")
-            # self.lib = ct.cdll.LoadLibrary(binary_path)
-            self.lib = ct.cdll.LoadLibrary(str(binary_path))            # $$$
-
-    @classmethod
-    def get_instance(cls):
-        if cls._instance is None:
-            cls._instance = cls.__new__(cls)
-            cls._instance.initialize()
-        return cls._instance
-
-
-lib = CUDALibrary_Singleton.get_instance().lib
-try:
-    lib.cadam32bit_g32
-    lib.get_context.restype = ct.c_void_p
-    lib.get_cusparse.restype = ct.c_void_p
-    COMPILED_WITH_CUDA = True
-except AttributeError:
-    warn(
-        "The installed version of bitsandbytes was compiled without GPU support. "
-        "8-bit optimizers and GPU quantization are unavailable."
-    )
-    COMPILED_WITH_CUDA = False