EndNote X7.1 libraries are not backwards-compatible with EndNote 7 or earlier versions. When opening a library from EndNote 5, 6, or 7, EndNote X7.1 will convert the library to the current format and leave the original library unchanged. EndNote X7.1 libraries consist of an .enl file and a .DATA folder that must be kept together when sharing libraries.
If you plan to send or email an EndNote library to someone, remember to send all of the files found in your library’s .DATA folder. To compress all of your library files and folders into a single file, see Saving a Compressed Copy of a Library. You can then send the single, compressed file to the other user, and they can restore the filename.enl file and its associated .DATA folder.