@ howardlander. Thanks for your question. However, it is really strange to have a file on a web server without a file extension. I can’t tell you why it is translated to .ed, but I can tell you that Easy Folder Listing Pro doesn’t change files or their info. It uses Joomla’s JFolder::folders and JFolder::files to get the file and info. So, it is possible that the Joomla PHP library is translating it.
I suggest that you should give every file its proper extension. If it is a text file, give it.txt. If it is an image, give it the relevant image extension. There is really no reasonable reason to not hide a file’s extension, especially on a web server. If you don’t want the file to be listed, then include it in the exfiles list in the Plugin manager.
Hope this helps.