My current plans are to support editing in the viewer pane of EagleFiler’s three-pane windows. I wasn’t planning to support opening documents in their own window in EagleFiler. You can already do this to some extent by using the Open In New Window command, which will open a new three-pane window, and I plan to make it easier to hide the source list and records list so that you can see more of the document. Beyond that, I think you’ll probably be better served using specialized apps like BBEdit, Word, Preview, Safari, etc. than for me to try to duplicate their viewing and editing functionality in EagleFiler.