With the following netlist:

* DC directive
V1 R 0 10
R1 R 0 1000
.dc V1 0 5 1
.end

stored as dc_rawtest.net

when running

xyce -r dc_xyce.bin.raw dc_rawtest.net, I get Plotname: DC transfer characteristic (as should)
with
xyce -r dc_xyce.ascii.raw -a dc_rawtest.net,I get Plotname: DC Sweep: Step 2 of 6 params: name = V1 value = 0 DC transfer characteristic. Not good.

Some parsers choke on that.