uncertain if that is a feature or a bug request I applied both flags. I noticed it seems impossible to just reference the workflow data directory. Whilst on Windows I do recall to have faces the seem issue on Linux and OS X.
Neither a dot not a forward nor backward slash do work which (currently) always requires to create sub-directories on the workflow directory. However, once these get deleted, the List File/Folders node fails.
Therefore, I’d also like to suggest to add an option to have the node NOT fail, like in the Delete Files/Folder Node, if the output is empty.