From 2c4e609b116de0cda31a6270b6b57724b52a9893 Mon Sep 17 00:00:00 2001
From: Roman Lavrov <roman.lavrov@thebrowser.company>
Date: Wed, 25 Mar 2026 16:24:21 -0400
Subject: [PATCH] Skip SetConsoleCP when stdout is non-interactive.

Fixes wixtoolset/issues#9267
---
 src/libs/dutil/WixToolset.DUtil/conutil.cpp | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/libs/dutil/WixToolset.DUtil/conutil.cpp b/src/libs/dutil/WixToolset.DUtil/conutil.cpp
index 059af0e03..858128cdb 100644
--- a/src/libs/dutil/WixToolset.DUtil/conutil.cpp
+++ b/src/libs/dutil/WixToolset.DUtil/conutil.cpp
@@ -67,9 +67,14 @@ extern "C" HRESULT DAPI ConsoleInitialize()
         vfConsoleOut = TRUE;
     }
 
-    if (!::SetConsoleCP(CP_UTF8) || !::SetConsoleOutputCP(CP_UTF8))
+    // Console codepage only applies to interactive sessions. SetConsoleCP may
+    // fail in console-less environments and the error path closes stdin/stdout.
+    if (vfStdOutInteractive)
     {
-        ConExitWithLastError(hr, "failed to set console codepage to UTF-8");
+        if (!::SetConsoleCP(CP_UTF8) || !::SetConsoleOutputCP(CP_UTF8))
+        {
+            ConExitWithLastError(hr, "failed to set console codepage to UTF-8");
+        }
     }
 
 LExit: