How to get registry key lastwritetime using batch/powershell

Question

Hello,
I want to get a registry key's LastWriteTime using batch/powershell.  These are what i have tried..
1. Launch regedit and manually export the key using the UI, this gives me the lastwritetime, but I need a commandline version of this.  regedit /e only exports the key and value data.
2. dir HKLM:\software\mykey
nothing returned
3. Get-ChildItem HKLM:\software\mykey |  Select-Object *
nothing returned
4. Get-ItemProperty HKLM:\software\mykey | Select-Object *
LastWriteTime not returned; other values are returned
5. (Get-Item HKLM:\software\mykey).LastWriteTime
Nothing is returned
Is the only way to do this by using pinvoke with RegQueryInfoKey? 
Thanks in advance
ss883r

Answer 1

The
.zip on the repository will still work for version 2. Basically, you'll get a definition for a function called 'Add-RegKeyMember'. You can dot source the provided script, or you can copy the function definition into your own script. You would use it like
this:
# Using Get-Item:
PS> Get-Item HKLM:\SOFTWARE | Add-RegKeyMember | select Name, LastWriteTime, ClassName  
# Using Get-ChildItem:
PS> Get-ChildItem HKLM:\SOFTWARE | Add-RegKeyMember | select Name, LastWriteTime, ClassName  
# Passing a path:
PS> Add-RegKeyMember HKLM:\SOFTWARE | select Name, LastWriteTime, ClassName
There's also a proxy function for Get-ChildItem that will automatically add the property anytime you use Get-ChildItem (dir, ls, gci) on a registry path. The PSv3 only method I was talking about simply updates the type data to automatically call the function
on any RegistryKey object. You can actually set version 2 up to do that, but it requires an XML file.