This file is indexed.

/usr/lib/X11/xsm/system.xsm is in x11-session-utils 7.6+2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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! $Xorg: system.xsm,v 1.3 2000/08/17 19:55:06 cpqbld Exp $
twm
smproxy
xterm