diff -r ea891871f481 -r bb5522e88ab2 misc/libphysfs/lzma/CPP/7zip/UI/Common/DefaultName.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/misc/libphysfs/lzma/CPP/7zip/UI/Common/DefaultName.cpp	Mon Apr 10 12:06:43 2017 -0400
@@ -0,0 +1,26 @@
+// DefaultName.cpp
+
+#include "StdAfx.h"
+
+#include "DefaultName.h"
+
+static const wchar_t *kEmptyFileAlias = L"[Content]";
+
+UString GetDefaultName2(const UString &fileName, 
+    const UString &extension, const UString &addSubExtension)
+{
+  int extLength = extension.Length();
+  int fileNameLength = fileName.Length();
+  if (fileNameLength > extLength + 1)
+  {
+    int dotPos = fileNameLength - (extLength + 1);
+    if (fileName[dotPos] == '.')
+      if (extension.CompareNoCase(fileName.Mid(dotPos + 1)) == 0)
+        return fileName.Left(dotPos) + addSubExtension;
+  }
+  int dotPos = fileName.ReverseFind(L'.');
+  if (dotPos > 0)
+    return fileName.Left(dotPos) + addSubExtension;
+  return kEmptyFileAlias;
+}
+