Returns the logical file name for the given file identification (ID) number.
FILE_NAME ( file_id )
file_id
Is the file identification number for which to return the file name. file_id is smallint.
nvarchar(128)
file_ID corresponds to the fileid column in sysfiles.
This example returns the file name for a file_ID of 1 (the master database file).
USE master
SELECT FILE_NAME(1)