I can't export graph in GIF format

[Laurent REMONTET <laurent.remontet@chu-lyon.fr>]

Hello

I have problem with S+ 2000 on Windows NT4: I can't export graph in GIF
format . I have try with "export.graph":
    export.graph("u:\\inci2000\\analyse\\incimort\\colonrc\\plot\\toto",
ExportType = "GIF", Name="GSD2"   )
and with "graphsheet"
    graphsheet(format="GIF",
file="u:\\inci2000\\analyse\\incimort\\colonrc\\plot\\toto")
    plot()...dev.off()
the results is the same (files created are empty ( 0 Ko)
Do you know this problem or an other solution to export in GIF format ?
thanks