[BioC] binary CEL file gunzipped

[D.Enrique ESCOBAR ESPINOZA]

I would like to know
how can I do to read binary.CEL.gz files
because R sends an error like this
Error in read.affybatch(filenames = l$filenames, phenoData =
l$phenoData,  : 
	Is
/affylims/genechip/lots/VAGIN_29-04-05/gcos_files/R006-05FX7Z08C1-R1.CEL.gz
really a CEL file? tried reading as text, gzipped text and binary
Execution halted

is there some treack that I can use
other than use gunzip?