This file is indexed.

/usr/lib/wine/wineserver is in wine-stable 3.0-1ubuntu1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh -e

wineserver32=/usr/lib/wine/wineserver32
wineserver64=/usr/lib/wine/wineserver64

if test -x "$wineserver64"; then
    wineserver=$wineserver64
elif test -x "$wineserver32"; then
    wineserver=$wineserver32
else
    echo "error: unable to find wineserver executable.  this shouldn't happen." >&2
    exit 1
fi

exec $wineserver -p0 "$@"