/usr/share/aqsis/shaders/surface/microscope.slx is in aqsis 1.8.1-4build1.
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 460803
param uniform float Kd
param uniform float Ka
varying float d
segment Init
pushif 0.800000012
pop Kd
pushif 0.200000003
pop Ka
segment Code
pushv N
normalize
pushv I
normalize
dotpp
pop d
pushv d
pushv d
mulff
pop d
pushv d
pushif 1
subff
pushv Kd
mulff
pushv Ka
addff
setfc
pushv Cs
pushv Os
mulcc
mulcc
pop Ci
pushv Os
pop Oi
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