Having almost completed the full-size viewer, I decided now would be a good time to start work on the directory picker (for selecting a directory to load images from). So far, I've made pretty good progress - you can browse directories by clicking to open a folder, or clicking "Move up" to move up a directory. Right-clicking on a folder selects it, and makes the program close the browser and load up the images from inside the folder. However, it's not all that aesthetically pleasing yet, as you'll see from the screenshot:
Don't worry though, as I'm hoping to polish it's appearance over the next few days, so soon it will be shiny.
More pressing are the bugs; for example, if a folder's name is too long it will go right of the edges of the window. Also, if a directory you're viewing has more than around 40 folders in it, many of them will be off the bottom of the screen - I'll be needing to implement some form of scrolling to resolve this. Both bugs are entirely fixable however, so we should be seeing the browser complete by the end of the week.