Clear-Host
$acl = get-acl "D:\Test"

#Paramètres dans l'ordre : Le compte, FileSystemRights (Read, ReadAndExecute, Write, Modify, ListDirectory, FullControl etc), InheritanceFlags (ContainerInherit None ou ObjectInherit), PropagationFlags (InheritOnly, None ou NoPropagateInherit) , AccessControlType (Allow, Deny)
$rule = New-Object System.Security.AccessControl.FileSystemAccessRule("robert","ReadAndExecute", "ContainerInherit, ObjectInherit", "None", "Allow")
$Acl.addAccessRule($rule) #ajout de la régle

$acl |Set-Acl #Appliquer les droits