Retrieving Directory Name or File Name using Powershell

# File should exist> (Get-Item 'C:\Windows\test.txt').DirectoryName
C:\Windows

> (Get-Item 'C:\Windows\test.txt').Name
test.txt

# File does not have to exist> Split-Path 'C:\Windows\test.txt'
C:\Windows

> Split-Path -Parent 'C:\Windows\test.txt'
C:\Windows

> Split-Path -Leaf 'C:\Windows\test.txt'
test.txt