Now that I (re)joined group, did a fuller search and see circa 2004 there was an issue with Guide sorter.exe sorting the XZ80Q.dat from vizier, and sorter required the dat from iota. Of course, my dat file circa 2004 is on a hdd n/a, so not knowing the above I got my current dat at vizier, and of course, the dataset is not running on w2k where I reinstalled Guide. Links posted here in 2004 to the iota dat are 404 now (today is 28mar_2010). Also link to Japan site did not take me to that dat file. Is this dataset "moot." Superseded, and if so by what? Not sure I'll ever be able to suck off the XZ80Q from my old hdd. Insight would be appreciated.