/usr/share/gromacs/top/ffG45a3.itp is in gromacs-data 4.5.5-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | ; This file is for backward compatibility only.
; Please directly include the file below in your .top file.
#include "gromos45a3.ff/forcefield.itp"
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