I've recently installed the i3 window manager on Arch Linux. I have been able to set everything up except the opening of apps into certain workspaces because some applications can only be opened via terminal (for e.g. the terminal mail client "mutt") because they do not have class names which could be found using xprop. So I'd like to know how to use the following command for those special apps without classes. My chromium browser has a class which can be used to identify the application:
assign [class="Chromium-browser"] $workspace3
Note: i3wm : start applications on specific workspaces when i3 starts is NOT a duplicate.