/usr/share/nsis/Contrib/Modern UI/ioSpecial.ini is in nsis-common 2.50-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Rect=1044
NumFields=3
[Field 1]
Type=bitmap
Left=0
Right=109
Top=0
Bottom=193
Flags=RESIZETOFIT
[Field 2]
Type=label
Left=120
Right=315
Top=10
[Field 3]
Type=label
Left=120
Right=315
|