File handle with value 1024 in CFileIO

[meekee7]

Rarely an error occurs in the destructor of CFileIO (part of Loader): the close functions causes an error because it was called with a file handle which has the value 1024.
Not closing the the handle when it is 1024 would be trivial. But it should be investigated how and why the handle becomes 1024 in the first place, as this is likely an indicator of some error or special condition.