Running the GAMESS (April 11, 2008 version) I get my results in .out files. Molekel will not open these .out files. Looking: http://molekel.cscs.ch/wiki/pmwiki.php/ReferenceGuide/FileFormats It says GAMESS output is .gam or .gamout; which I have not heard of. If I rename my output files to this then it gives me "Cannot read: C:/Filename.gam with Molekel 4.6 read_gamess() function." As far as I know the standard output for GAMESS on the systems I worked the output files is with .out extension. Has anyone had a similar problem or know a fix for this?