Honestly would be pretty cool if we could have an alias name on Binary Data elements, so it wouldn't be a massive url as name... It would allow a "folder structure" cause it wouldn't really be a folder, just a name containing "\"
Well you can use Apppath$ + "data_folder\file.png". Perhaps we could simplify it with "#Apppath#\data_folder\file.png", but that wouldn't be a big difference.