From 556728c04a5cfb82ed4f7bd19b9b25b101e127c3 Mon Sep 17 00:00:00 2001
From: Carbon Cowboy <254348425+carboncowboy@users.noreply.github.com>
Date: Mon, 2 Feb 2026 17:18:45 -0800
Subject: Improve windir detection in LLDir::openDir

---
 indra/llfilesystem/lldir.cpp | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/indra/llfilesystem/lldir.cpp b/indra/llfilesystem/lldir.cpp
index 7d547ca4be..22bb50074a 100644
--- a/indra/llfilesystem/lldir.cpp
+++ b/indra/llfilesystem/lldir.cpp
@@ -1116,7 +1116,16 @@ void LLDir::openDir(const std::string& filepath)
 
 #if LL_WINDOWS
     // Windows: Use explorer.exe with /select flag to highlight the file
-    std::string system_root = LLStringUtil::getenv("SystemRoot", "C:\\Windows");
+    std::string system_root = LLStringUtil::getenv("SystemRoot");
+    if (system_root.empty())
+    {
+        system_root = LLStringUtil::getenv("WINDIR");
+    }
+    if (system_root.empty())
+    {
+        LL_WARNS() << "Neither SystemRoot nor WINDIR environment variable is set" << LL_ENDL;
+        system_root = "C:\\Windows"; // Last resort fallback
+    }
     params.executable = system_root + "\\explorer.exe";
     params.args.add("/select,");
     params.args.add(filepath);
-- 
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