File System Information - Test path, or handle extension, creation time, last access time

$ExecutionContext.SessionState.Path.GetUnresolvedProviderPathFromPSPath("fake.txt")

File Attributes - Set file system attributes like read only, hidden, always keep on this device

$i = Get-Item '.\enveloppe\' -Force
$i.Attributes = $i.Attributes -bxor [IO.FileAttributes]::Hidden }
$i.Attributes

12 items under this folder.