/usr/share/doc/nsis/Examples/InstallOptions/test.ini is in nsis-doc 2.46-7.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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NumFields=8
[Field 1]
Type=GroupBox
Left=0
Right=-1
Top=0
Bottom=-5
Text=" This is a group box... "
[Field 2]
Type=checkbox
Text=Install support for X
Left=10
Right=-10
Top=17
Bottom=25
State=0
Flags=GROUP
[Field 3]
Type=checkbox
Text=Install support for Y
Left=10
Right=-10
Top=30
Bottom=38
State=1
Flags=NOTABSTOP
[Field 4]
Type=checkbox
Text=Install support for Z
Left=10
Right=-10
Top=43
Bottom=51
State=0
Flags=NOTABSTOP
[Field 5]
Type=FileRequest
State=C:\poop.poop
Left=10
Right=-10
Top=56
Bottom=68
Filter=Poop Files|*.poop|All files|*.*
Flags=GROUP|FILE_MUST_EXIST|FILE_EXPLORER|FILE_HIDEREADONLY
[Field 6]
Type=DirRequest
Left=10
Right=-10
Top=73
Bottom=85
Text=Select a directory...
State=C:\Program Files\NSIS
[Field 7]
Type=Label
Left=10
Right=-10
Top=90
Bottom=98
Text=This is a label...
[Field 8]
Type=Text
Left=10
Right=-10
Top=98
Bottom=120
State="Multiline\r\nedit..."
Flags=MULTILINE|VSCROLL|WANTRETURN
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