Powershell command that will move based on ownership and file type

Need a command (doesn't HAVE to be PowerShell) that will find all Microsoft Office files  in a folder and all subfolders owned by a specific user and then move them to another location.

I know that I will probably have to run the command over each team with a different extension such as .doc, .xls.

So far I have a powershell command that will do everything except find the files by type. I have the following command:

Get-Children -recurse d:\foldername | get-acl | where {$_.Owner -match "username" } | Move-Item -Destination "h:\foldername" -recurse