How to replace a single file using: run library file.lbt?

Problem:

How to replace a single file using: run library file.lbt and how to note down?

a) for a single file, i.e.

RUN LIBRARY FILE1.XXX LIBRARY1.LBR = LIBRARY1.LBR

b) within .LBT file, i.e. FILE.LBT:

FILE1.XXX

LIBRARY1.LBR

= LIBRARY1.LBR

RUN LIBRARY FILE.LBT

Old KB# 7107