$inputDirectory = "inPath"
$outputDirectory = "outPath"

if (-not (Test-Path -Path $outputDirectory)) {
    New-Item -ItemType Directory -Path $outputDirectory
}

Get-ChildItem -Path $inputDirectory -Filter *.svg | ForEach-Object {
    $inputFilePath = $_.FullName
    $outputFilePath = Join-Path -Path $outputDirectory -ChildPath ($_.BaseName + ".png")

    & 'C:\Program Files\Inkscape\bin\inkscape.exe' `
        --export-type="png" `
        --export-filename="$outputFilePath" `
        --export-dpi=800 `
        $inputFilePath
}