Each EndNote library is made up of a filename.ENL file and an associated .DATA folder. If you want to back up, move or share a library, you must remember both files. To make this easy, the Macintosh OS allows packaging the files in a folder that looks like a single file. You can open the package as you would any EndNote library, and you never have to worry about forgetting the .DATA folder when you move the library to another location.
If you are share a packaged EndNote library with an EndNote for Windows user, the Windows user sees the package as an ordinary folder that contains the filename.ENL file and filename.DATA folder.
To create an EndNote Library Package:
From the File menu, select either New to create a new library or Save a Copy to create a copy of the currently open library.
Name the file and choose where to save it.
Select the Save as Package option.
Click Save and EndNote creates a packaged version of the library.
The package appears on disk as a single file with the extension .ENLP, and is really a special folder that contains your EndNote library plus its associated .DATA folder.