This file is indexed.

/usr/share/massxpert/dictionaries/protein-1-to-3.dic is in massxpert-data 3.2.0-2.

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

The actual contents of the file can be viewed below.

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# Converts from code on the left of '>' to code on the right.
# Number of letters allowed in each code is 
# described with syntax 1>3 and that line should be the first
# non-comment line in this file.
1>3
A>Ala
C>Cys
D>Asp
E>Glu
F>Phe
G>Gly
H>His
I>Ile
K>Lys
L>Leu
M>Met
N>Asn
P>Pro
Q>Gln
R>Arg
S>Ser
T>Thr
V>Val
W>Trp
Y>Tyr