X64-Question in TGpHugeFile: BufOffs maybe too short

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In Unit GpHugeF.pas

the class (and some functions) use a Buffer-Offset. But this offset is defined 
as DWORD. 
Is there any possibility in X64 and very large files (I have >3GB-Files), that 
the BufOffset is too small?

  TGpHugeFile = class
  private
    hfAsynchronous     : boolean;
    hfBlockSize        : DWORD;
    (...)
    hfBufFilePos       : HugeInt; //cached FilePos (according the current hfBufOffs)
    hfBufOffs          : DWORD;   //current position inside the buffer


Suggestion:
   hfBufOffs          : HugeInt;

Original issue reported on code.google.com by [email protected] on 25 Mar 2015 at 8:58