Nathan,
That looks suspiciously like a file generated with Spec. Enabling the "SPEC" (and/or "SpecFileLongLine") plugins in the Plugin registry doesn't seem to work either. I don't know why that doesn't work.
I am not an expert at dealing with spec files, but I was able to read this file with PyMca, and with the larch Spec reader (which uses PyMca, and requires it to be installed), using something like
larch> scan1_roi1 = read_specfile(FileName, scan=1, cntx='Energy', csig='roi1', cmon='I0')
(and, indeed it looks like Zr XANES) That's not exactly "open and read with Athena", but hopefully it provides a clue....
--Matt