/usr/share/doc/quantum-espresso/html/images.pl is in quantum-espresso-data 6.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | # LaTeX2HTML 2008 (1.71)
# Associate images original text with physical files.
$key = q/sim;MSF=1.6;LFS=12;AAT/;
$cached_env_img{$key} = q|<IMG
WIDTH="19" HEIGHT="19" ALIGN="BOTTOM" BORDER="0"
SRC="|."$dir".q|img2.png"
ALT="$ \sim$">|;
1;
|