Codigo:

$files = Get-ChildItem "F:\x360" -Filter "*.7z" -File
 
foreach ($file in $files) {
 
    $destination = Join-Path "G:\x360iso" $file.BaseName
 
    New-Item -ItemType Directory -Path $destination -Force | Out-Null
 
    Write-Host "Extrayendo: $($file.Name)"
 
    & "C:\Program Files\7-Zip\7z.exe" x -y `
        $file.FullName `
        "-o$destination"
 
    Write-Host "Terminado: $($file.Name)"
}

Output

Explicacion:

$files = Get-ChildItem "F:\x360" -Filter "*.7z" -File

foreach ($file in $files)

$destination = Join-Path "G:\x360iso" $file.BaseName

New-Item -ItemType Directory -Path $destination -Force | Out-Null

  Write-Host "Extrayendo: $($file.Name)"

  & "C:\Program Files\7-Zip\7z.exe" x -y `
      $file.FullName `
      "-o$destination"

  Write-Host "Terminado: $($file.Name)"