To save a new filter that you have just created, or to save changes to a filter you have just modified, select Save or Save As from the File menu.
If you have modified one of the original installed files in the Program Files\EndNote\FiltersApplications/EndNote /Filters folder, you must use Save As to save a copy to your personal Filters folder. If you have modified a style that is already located in your personal Filters folder, you can select either Save to directly modify the file, or Save As to make a copy with the changes. For a description of where your styles are stored, see Folder Locations.
EndNote automatically saves new filters to your personal Filters folder. You may also specify a different folder if necessary. For instructions see Folder Locations.
EndNote filters use the file name extension of ". ENF" (for EndNote Filter), as in " Medline.enf.