diff --git a/Lib/sysconfig/__init__.py b/Lib/sysconfig/__init__.py
index 8ff9c99435bb1aa..1f780bc8f44ec00 100644
--- a/Lib/sysconfig/__init__.py
+++ b/Lib/sysconfig/__init__.py
@@ -665,12 +665,17 @@ def get_platform():
 
     For other non-POSIX platforms, currently just returns :data:`sys.platform`."""
     if os.name == 'nt':
+        # Check for architecture in sys.version first, then fall back to sys.maxsize
+        # which is reliable even when sys.version is truncated (e.g., clang builds on Windows)
         if 'amd64' in sys.version.lower():
             return 'win-amd64'
-        if '(arm)' in sys.version.lower():
-            return 'win-arm32'
+        if sys.maxsize > 2**32:
+            # 64-bit Windows where sys.version may be truncated
+            return 'win-amd64'
         if '(arm64)' in sys.version.lower():
             return 'win-arm64'
+        if '(arm)' in sys.version.lower():
+            return 'win-arm32'
         return sys.platform
 
     if os.name != "posix" or not hasattr(os, 'uname'):
diff --git a/Mac/PythonLauncher/Info.plist.in b/Mac/PythonLauncher/Info.plist.in
index ce8f27cd7d4de70..0d090f5a1fef1e7 100644
--- a/Mac/PythonLauncher/Info.plist.in
+++ b/Mac/PythonLauncher/Info.plist.in
@@ -57,6 +57,10 @@
 	<string>%VERSION%</string>
 	<key>CFBundleSignature</key>
 	<string>PytL</string>
+	<key>CFBundleSupportedPlatforms</key>
+	<array>
+		<string>MacOSX</string>
+	</array>
 	<key>CFBundleVersion</key>
 	<string>%VERSION%</string>
 	<key>NSMainNibFile</key>