I'm testing Jalview starting Chimera (1.10.1) with RESTServer on a Windows 7 machine without gzip installed. On starting the Chimera process: new ProcessBuilder().start("chimera.exe", "--start", "RESTServer") I get two lines of response: Cannot execute 'gzip': no automatic decompression of .Z files REST server on host 127.0.0.1 port nnnnn which is ok - I can get the REST port number I need and carry on. Am I safe to ignore the other message? I can't see what file (I assume part of the Chimera installation) it is arising from. Thanks, Mungo Mungo Carstairs Jalview Computational Scientist The Barton Group Division of Computational Biology College of Life Sciences University of Dundee, Dundee, Scotland, UK. www.jalview.org<http://www.jalview.org/> www.compbio.dundee.ac.uk<http://www.compbio.dundee.ac.uk/> The University of Dundee is a registered Scottish Charity, No: SC015096