fixed library loading

 * use os.pathsep

bitsandbytes/__main__.py

@@ -67,7 +67,7 @@ def generate_bug_report_information():
     print_header("LD_LIBRARY CUDA PATHS")
     if 'LD_LIBRARY_PATH' in os.environ:
         lib_path = os.environ['LD_LIBRARY_PATH'].strip()
-        for path in set(lib_path.split(':')):
+        for path in set(lib_path.split(os.pathsep)):
             try:
                 if isdir(path):
                     print_header(f"{path} CUDA PATHS")

bitsandbytes/cuda_setup/env_vars.py

@@ -26,7 +26,7 @@ def to_be_ignored(env_var: str, value: str) -> bool:
 
 
 def might_contain_a_path(candidate: str) -> bool:
-    return "/" in candidate
+    return os.sep in candidate
 
 
 def is_active_conda_env(env_var: str) -> bool:

bitsandbytes/cuda_setup/main.py

@@ -19,6 +19,7 @@
 import ctypes as ct
 import os
 import errno
+import platform
 import torch
 from warnings import warn
 from itertools import product
@@ -31,7 +32,11 @@
 # libcudart.so is missing by default for a conda install with PyTorch 2.0 and instead
 # we have libcudart.so.11.0 which causes a lot of errors before
 # not sure if libcudart.so.12.0 exists in pytorch installs, but it does not hurt
-CUDA_RUNTIME_LIBS: list = ["libcudart.so", 'libcudart.so.11.0', 'libcudart.so.12.0', 'libcudart.so.12.1', 'libcudart.so.12.2']
+system = platform.system()
+if system == 'Windows':
+    CUDA_RUNTIME_LIBS: list = ["nvcuda.dll"]
+else: # Linux or other
+    CUDA_RUNTIME_LIBS: list = ["libcudart.so", 'libcudart.so.11.0', 'libcudart.so.12.0', 'libcudart.so.12.1', 'libcudart.so.12.2']
 
 # this is a order list of backup paths to search CUDA in, if it cannot be found in the main environmental paths
 backup_paths = []
@@ -193,7 +198,7 @@ def is_cublasLt_compatible(cc):
     return has_cublaslt
 
 def extract_candidate_paths(paths_list_candidate: str) -> Set[Path]:
-    return {Path(ld_path) for ld_path in paths_list_candidate.split(":") if ld_path}
+    return {Path(ld_path) for ld_path in paths_list_candidate.split(os.pathsep) if ld_path}
 
 
 def remove_non_existent_dirs(candidate_paths: Set[Path]) -> Set[Path]: