[gdal-dev] GDAL unable to recognize large GRC file

[jt2000]

I have a large (>500MB) GRC file that is not being read by GDAL correctly.

*[me at server data]$ gdalinfo filename.grc
ERROR 4: `filename.grc' not recognised as a supported file format.

gdalinfo failed - unable to open 'filename.grc'.*

Is this due to the size?  I have other 200MB files that work fine.
The accompanying Mapinfo TAB file shows the following.

!table
!version 300
!charset Neutral

Definition Table
  File "filename.grc"
  Type "RASTER"
  (280380.000000,3512760.000000) (0,0) Label "Pt 1",
  (1057470.000000,2824500.000000) (25903,22942) Label "Pt 2",
  (280380.000000,2824500.000000) (0,22942) Label "Pt 3"
CoordSys Earth Projection 8,74,"m",-99,0,0.9996,500000,0
ReadOnly
begin_metadata
"\Vm\Grid" = "Character"
"\IsReadOnly" = "FALSE"
end_metadata 

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