| 
 | The ornamental design for a nail file, as shown and described. | |||||||||||||||||
FIG. 1 is a perspective view of a nail file showing my new design;
FIG. 2 is an elevational end view thereof, the end opposite being a mirror image;
FIG. 3 is a side elevational view of a first thereof;
FIG. 4 is a side elevational view of a second thereof;
FIG. 5 is a side elevational view of a third thereof; and,
FIG. 6 is a side elevational view of a fourth thereof.
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