Bruce, I tried with the version 1.0076 found on the download site. The results are basically same as for 1.0074 If I had SET IFEFFIT_DIR='C:\Program Files\Ifeffit' --no help. SET IFEFFIT_DIR="C:\Program Files\Ifeffit" --sovle the path problem, but introduce some other 'complaining' message shown below. Athena runs. print() on closed filehandle I at athena line 175. print() on closed filehandle I at athena line 196. Unable to write temp config file "C:\Program Files\Ifeffit"\athena.ini-new: No s uch file or directory at athena line 221 print() on closed filehandle M at athena line 240. SET IFEFFIT_DIR=C:\Progra~1\Ifeffit --Runs ok. Zhan -- Zhan Zhang Northwestern University Argonne National Laboratory Materials Science & Engineering Department Environmental Research Division MLSB 2017 Building 203, C-137 2225 N. Campus Dr 9700 Cass Ave Evanston, IL 60208 Argonne, IL 60439 Tel: (630) 252-8629 Fax: (630) 252-5498 zhanzhang@northwestern.edu