FLVPlayback and preloader size difference

Hello,

  I have put a preloader on a movie that plays a FLV (preloader on frame 1 and the FLVPlayback on frame 2).  The problem is that the preloader thinks that the file size is only 38Kb and the FLV is 27,000Kb.  So how do I make the preloader read the size of the FLV?

  Thank you for your time,

     Bernie