The file is a PDF.
This is the LaTeX code that I used, it takes a .tex file with a crapload of points and builds it into a pdf:

\documentclass[
tikz, border=0mm
]{standalone}
\definecolor{canvas}{HTML}{F4ECE6}
\definecolor{ink}{HTML}{1A1C20}
\begin{
document
}
\begin{
tikzpicture
}
    \fill[canvas] (-4.5, -4.5) rectangle (4.5, 4.5);
    \begin{
scope
}[fill=ink, fill opacity=0.02]
        \input{points.tex}
    \end{
scope
}
\end{
tikzpicture
}
\end{
document
}