From 9a8592e7d4d69b785df8b5d9d7b694cb6cbb149f Mon Sep 17 00:00:00 2001
From: Tim Esler <tim.esler@gmail.com>
Date: Fri, 22 Aug 2025 05:47:19 -0700
Subject: [PATCH] Add PATHEXT to default STDIO env vars in windows (#1256)

---
 src/mcp/client/stdio/__init__.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/mcp/client/stdio/__init__.py b/src/mcp/client/stdio/__init__.py
index 50bcedde..e3532e98 100644
--- a/src/mcp/client/stdio/__init__.py
+++ b/src/mcp/client/stdio/__init__.py
@@ -32,6 +32,7 @@ DEFAULT_INHERITED_ENV_VARS = (
         "HOMEPATH",
         "LOCALAPPDATA",
         "PATH",
+        "PATHEXT",
         "PROCESSOR_ARCHITECTURE",
         "SYSTEMDRIVE",
         "SYSTEMROOT",