Comment of PreserveFileName argument

Source commit: 2672a9bf752a110cad90da994606c2f0f4c9b254

source/windows/VCLCommon.cpp

@@ -1301,6 +1301,7 @@ bool __fastcall SelectDirectory(UnicodeString & Path, const UnicodeString Prompt
   {
     UnicodeString Directory;
     UnicodeString FileName;
+    // We do not have any real use for the PreserveFileName
     if (!PreserveFileName || DirectoryExists(ApiPath(Path)))
     {
       Directory = Path;