Michel, Thanks -- I completely agree. Our data collecion program (and at least one other at an APS beamline where athena is used heavily, and I suspect many others) use the file extension for scan number: datafile.001, datafile.002, ... On top of that, many of the analysis programs (at least the ones I use!) keep related files as datafile.xmu, datafile.chi, datafile.rsp, ... Because of this, I find the Windows 'hide file extensions' to be completely unusable for handling real data analysis based on small ascii files. I make sure this feature is turned off on all our beamline computers where people will be running athena, artemis, and sixpack, and wouldn't expect athena to try to recover from Windows "very clever" ability to hide file extenstions... --Matt