为何修改文档箭头颜色时始终出现颜色错误？

我想把文档中所有箭头的颜色改成红色，但执行代码后箭头始终变成蓝色。最初尝试的代码如下：

$shapes = $doc.Shapes
foreach ($shape in $doc.Shapes) {
    if($shape.Name -like "Straight Arrow Connector*"){
        $red = [System.Drawing.Color]::FromArgb(255,255,0,0)
        $shape.Line.ForeColor.RGB = $red.ToArgb()
    }
}

最终使用以下代码解决了问题：

$shapes = $doc.Shapes
$color = [System.Drawing.Color]::Red
$red = $color.R + 0x100 * $color.G + 0x10000 * $color.B
foreach ($shape in $doc.Shapes) {
        if($shape.Name -like "Straight Arrow Connector*"){
              $shape.Line.ForeColor.RGB = $red
        }
}

内容的提问来源于stack exchange，提问作者ScareFries