How does Gnome determine the "type" of a file. The type can be discovered by right clicking on the file icon in Nautilus, and then selecting the tab "Open With". I suspect that the type is determined by the type as reported by the file command, by the file's extension, and by tables of mime types in the system. Is this correct? The rules don't seem to be documented anywhere, nor is there any advice on how to set up the tables. Why am I interested? I'm trying to set up nautilus so that clicking on a XML file with extension ".aup" will start Audacity. (".aup" is the extension used by the Audacity audio editor for the files it uses.) On my system, the type of such an .aup file is "XML document", which is associated (quite reasonably) with Firefox and a number of editors. I'd like to set things up so that files with extension .aup will have their own type, which could be associated with Audacity. How can such a type be created, etc.? Thanks - jon -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines