Hi David, Since you talk about adding an extension to the Gerber list I assume you are referring to the Nightly version that I post here, since FlatCAM does not have this, it just open (or try to) any kind of file. Perhaps I did not say it but the Nightly's are just a fork of the "real" FlatCAM. Your comment made me feel guilty because, after all, Juan created this place for the FlatCAM and not for an "offshoot" like the builds that I post in the Nightly topic. And FlatCAM is FlatCAM ... the only real stable version of FlatCAM. The builds I post in the Nightly topic are something that I do for me and share with you guys. If occasionally I add features from requests, it's because I think it's fun and maybe I like it. Let's keep requests for the builds I make to the Nightly topic and do not pollute the FlatCAM discussion forum. Otherwise we create a mess and people will not know which FlatCAM are we talking about. Perhaps I will change the name to something like FlatCAM1000 or the like so we can make clear references. To answer your question: - I will add the .GB R extension to the default list although for the moment you can click on the drop-down extension menu and select All Files which will make visible all the files. - I don't see the real benefit of having config files all over. Sorry. But I may add the possibility for the user to create it's own config files that will be possible to be loaded through menu -> Preferences . For the moment, default settings is a mess because FlatCAM followed a philosophy (project based default settings combined with app default settings) and I try a different one (application only based default settings).