VFSFileOpen on root directory causes returns vfsErrNotADirectory on enumerate?

[Ryan Rix]

Hi all,
This is probably something really stupid that I am missing, but after 
successfully opening the root of a VFS directory I call 
VFSDirEntryEnumerate().
This returns 0x2a11 or vfsErrNotADirectory.
   err= VFSFileOpen( refNum, dir, vfsModeRead, &fref );
   if( err != errNone ) // This evaluates to true.
   {
       StrPrintF( buffer1, "%x", err );
       FrmCustomAlert( 10021, buffer1, "", "" );
   }

   err = VFSDirEntryEnumerate( fref, &diriterator, &finfo );
   if( err != errNone )
   {
       StrPrintF( buffer1, "Error: 0x%x", err );
       FrmCustomAlert( 10021, buffer1, "", "" ); // "Error: 0x2A11"
   }

is there anything I am missing? Perhaps passing the wrong directory 
argument to VFSFileOpen?

Thanks,
Ryan Rix

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