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diff --git a/indra/llfilesystem/lldirguard.h b/indra/llfilesystem/lldirguard.h
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+++ b/indra/llfilesystem/lldirguard.h
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+/** 
+ * @file lldirguard.h
+ * @brief Protect working directory from being changed in scope.
+ *
+ * $LicenseInfo:firstyear=2009&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2010, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_DIRGUARD_H
+#define LL_DIRGUARD_H
+
+#include "linden_common.h"
+#include "llerror.h"
+
+#if LL_WINDOWS
+class LLDirectoryGuard
+{
+public:
+	LLDirectoryGuard()
+	{
+		mOrigDirLen = GetCurrentDirectory(MAX_PATH, mOrigDir);
+	}
+
+	~LLDirectoryGuard()
+	{
+		mFinalDirLen = GetCurrentDirectory(MAX_PATH, mFinalDir);
+		if ((mOrigDirLen!=mFinalDirLen) ||
+			(wcsncmp(mOrigDir,mFinalDir,mOrigDirLen)!=0))
+		{
+			// Dir has changed
+			std::string mOrigDirUtf8 = utf16str_to_utf8str(llutf16string(mOrigDir));
+			std::string mFinalDirUtf8 = utf16str_to_utf8str(llutf16string(mFinalDir));
+			LL_INFOS() << "Resetting working dir from " << mFinalDirUtf8 << " to " << mOrigDirUtf8 << LL_ENDL;
+			SetCurrentDirectory(mOrigDir);
+		}
+	}
+
+private:
+	TCHAR mOrigDir[MAX_PATH];
+	DWORD mOrigDirLen;
+	TCHAR mFinalDir[MAX_PATH];
+	DWORD mFinalDirLen;
+};
+#else // No-op outside Windows.
+class LLDirectoryGuard
+{
+public:
+	LLDirectoryGuard() {}
+	~LLDirectoryGuard() {}
+};
+#endif 
+
+
+#endif