I have the following simple Powershell script:
ii E:\\Source\\Development\\websites\\example.com.au\\root
ii E:\\Source\\Development\\websites\\example.com.a
Use AppActivate method, don't forget to send Enter key to gain focus, then Alt Spacebar X ("% X") to maximize.
$folder = "C:\Temp"
ii $folder
Start-Sleep -m 100
[void][System.Reflection.Assembly]::LoadWithPartialName('Microsoft.VisualBasic')
[Microsoft.VisualBasic.Interaction]::AppActivate("$folder")
Start-Sleep -m 100
[void][System.Reflection.Assembly]::LoadWithPartialName('System.Windows.Forms')
[System.Windows.Forms.SendKeys]::SendWait("{ENTER}")
[System.Windows.Forms.SendKeys]::SendWait("% X")
Wrap a loop and you are all set.