Index: src/libchcore/TLocalFilesystem.cpp
===================================================================
diff -u -N -rcde3645c5041aedd6703b81b6fed42134c615917 -r751648800daaa5e2e42a48075aae11265cfd6564
--- src/libchcore/TLocalFilesystem.cpp	(.../TLocalFilesystem.cpp)	(revision cde3645c5041aedd6703b81b6fed42134c615917)
+++ src/libchcore/TLocalFilesystem.cpp	(.../TLocalFilesystem.cpp)	(revision 751648800daaa5e2e42a48075aae11265cfd6564)
@@ -190,7 +190,8 @@
 			THROW_CORE_EXCEPTION(eErr_InvalidArgument);
 
 		WIN32_FIND_DATA wfd;
-		HANDLE hFind = FindFirstFile(PrependPathExtensionIfNeeded(pathFile).ToString(), &wfd);
+
+		HANDLE hFind = FindFirstFileEx(PrependPathExtensionIfNeeded(pathFile).ToString(), FindExInfoBasic, &wfd, FindExSearchNameMatch, nullptr, FIND_FIRST_EX_LARGE_FETCH);
 		if (hFind != INVALID_HANDLE_VALUE)
 		{
 			FindClose(hFind);
@@ -235,10 +236,12 @@
 
 	TSmartPath TLocalFilesystem::PrependPathExtensionIfNeeded(const TSmartPath& pathInput)
 	{
-		if (pathInput.GetLength() >= 248)
-			return PathFromString(_T("\\\\?\\")) + pathInput;
-		else
-			return pathInput;
+		const TSmartPath pathPrefix = PathFromString(L"\\\\?\\");
+
+		if (pathInput.GetLength() >= 248 && !pathInput.StartsWith(pathPrefix))
+			return pathPrefix + pathInput;
+
+		return pathInput;
 	}
 
 	TLocalFilesystem::EPathsRelation TLocalFilesystem::GetPathsRelation(const TSmartPath& pathFirst, const TSmartPath& pathSecond)
Index: src/libchcore/TPath.cpp
===================================================================
diff -u -N -r27c262eb9cae55720e10f4886af6b5a82cb94fe9 -r751648800daaa5e2e42a48075aae11265cfd6564
--- src/libchcore/TPath.cpp	(.../TPath.cpp)	(revision 27c262eb9cae55720e10f4886af6b5a82cb94fe9)
+++ src/libchcore/TPath.cpp	(.../TPath.cpp)	(revision 751648800daaa5e2e42a48075aae11265cfd6564)
@@ -891,7 +891,7 @@
 		return !HasDrive() && !HasServerName();
 	}
 
-	bool TSmartPath::StartsWith(const TSmartPath& rPath, bool bCaseSensitive)
+	bool TSmartPath::StartsWith(const TSmartPath& rPath, bool bCaseSensitive) const
 	{
 		if(bCaseSensitive)
 			return m_strPath.StartsWith(rPath.m_strPath.c_str());
Index: src/libchcore/TPath.h
===================================================================
diff -u -N -re96806b7f8ff7ca7e9f4afbea603e6351a3dc3e3 -r751648800daaa5e2e42a48075aae11265cfd6564
--- src/libchcore/TPath.h	(.../TPath.h)	(revision e96806b7f8ff7ca7e9f4afbea603e6351a3dc3e3)
+++ src/libchcore/TPath.h	(.../TPath.h)	(revision 751648800daaa5e2e42a48075aae11265cfd6564)
@@ -112,7 +112,7 @@
 		void PrependSeparatorIfDoesNotExist();
 		void StripSeparatorAtFront();
 
-		bool StartsWith(const TSmartPath& rPath, bool bCaseSensitive = DefaultCaseSensitivity);
+		bool StartsWith(const TSmartPath& rPath, bool bCaseSensitive = DefaultCaseSensitivity) const;
 
 		bool IsEmpty() const;
 		size_t GetLength() const;