Folks:
Please forgive me if you get this message more than once. I want to make sure this gets out to everybody who needs to know.
The STEREO mission uses a particular kind of ephemeris file known as SPICE for the orbit and attitude information, and there are routines in the SolarSoft "$SSW/stereo/gen" tree for handling the files. The upcoming Solar Orbiter and Solar Probe Plus missions will also use the SPICE ephemeris system, so the STEREO software for handling SPICE files has been migrated to a separate package called "SunSPICE". This should be transparent to most users, but people who are using SolarSoft under Windows will need to install the SunSPICE package on their machines. This is explained on this website:
http://stereo-ssc.nascom.nasa.gov/sunspice.shtml
Please let me know if you have any problems.
Bill Thompson