/usr/share/aqsis/shaders/surface/showuser.slx is in aqsis 1.8.2-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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AQSIS_V 2
segment Data
USES 460806
param varying color myvcolor
varying normal Nf
segment Init
pushif 0
setfc
pop myvcolor
segment Code
pushv I
pushv N
normalize
faceforward
pop Nf
pushv Os
pop Oi
pushv Nf
diffuse
pushv myvcolor
pushv Os
mulcc
mulcc
pop Ci
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