Thanks for adding the explorer view. This is very useful.
I only have a couple of comments.
1. Currently, cdrtfe does not save the state of the explorer view. If you enable it and then restart the program, it is disabled again (even if you use the save option in the settings dialog). It would also be nice if the explorer view remembered the last selected drive/folder.
2. I don't know how it looks from a visual prospective, but for me at least it would be more convenient if the explorer view were positioned immediately to the right of the compilation view in the tab order when navigating via keyboard.
Thanks and regards.