/usr/share/lyx/examples/iecc07.fen is in lyx-common 2.1.4-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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r1bqk1nr/1p2bppp/p1npp3/8/3NP3/2N3P1/PPP2PBP/R1BQK2R w KQkq - 0 8