diff --git a/platform/native/lui_webapp/test/lui_webapp_test.ml b/platform/native/lui_webapp/test/lui_webapp_test.ml
index ac0c7949..f0803fd3 100644
--- a/platform/native/lui_webapp/test/lui_webapp_test.ml
+++ b/platform/native/lui_webapp/test/lui_webapp_test.ml
@@ -376,13 +376,11 @@ let test_boot_fallback () =
 
 let cli_exe () = Filename.dirname Sys.executable_name / ".." / "main.exe"
 
+(* Spawn the launcher directly: no [sh -c] indirection, whose quoting
+   and path translation of a native Windows path is shell-dependent
+   (a fresh Cygwin sh exits 127 on it). *)
 let run_cli args =
-  let cmd =
-    List.fold_left
-      (fun acc a -> acc ^ " " ^ Filename.quote a)
-      (Filename.quote (cli_exe ())) args
-  in
-  let r = P.Proc.run "sh" [ "-c"; cmd ] in
+  let r = P.Proc.run (cli_exe ()) args in
   (r.P.Proc.status, String.trim (r.P.Proc.stdout ^ r.P.Proc.stderr))
 
 let test_cli_errors () =
diff --git a/platform/native/lui_webview/lui_webview_stubs.m b/platform/native/lui_webview/lui_webview_stubs.m
index 021c257d..677d6304 100644
--- a/platform/native/lui_webview/lui_webview_stubs.m
+++ b/platform/native/lui_webview/lui_webview_stubs.m
@@ -1025,6 +1025,12 @@ extern __declspec(dllimport) long LUI_STDCALL GetHGlobalFromStream(
 extern __declspec(dllimport) long LUI_STDCALL CreateStreamOnHGlobal(
     void *, int, void **);
 extern __declspec(dllimport) void LUI_STDCALL CoTaskMemFree(void *);
+#else
+/* <windows.h> came in via SDL_syswm.h, which defines
+   WIN32_LEAN_AND_MEAN: that skips the COM headers, so the real
+   CoTaskMemFree / CreateStreamOnHGlobal / GetHGlobalFromStream protos
+   must be pulled in explicitly. */
+#include <objbase.h>
 #endif /* !WINAPI — no real Win32 headers in this TU */
 
 typedef struct {