Exercise: answer to an old forum question.

test.ps1

<#
    .LINK
    https://social.technet.microsoft.com/Forums/scriptcenter/en-US/bfe66e89-e6ea-48e8-bcab-6f260493944e/powershell-listing-of-all-files-and-owner-to-csv
#>

# version 1. Note that "-Attributes" was not available in 2010 (PoSh2)
Get-ChildItem -Recurse -Attributes !Directory |
    ForEach-Object { Add-Member -InputObject $_ -NotePropertyName Acl -NotePropertyValue (Get-Acl $_.FullName) -PassThru } |
    Select-Object DirectoryName,Name,length,@{Name='Owner';Expression={$_.acl.Owner}}

# version 2, better. I discovered GetAccessControl()
Get-ChildItem -Recurse -Attributes !Directory |
    Select-Object DirectoryName,Name,Length,@{Name='Owner';Expression={$_.GetAccessControl().Owner}}



# Select from an ACL attribute.
Get-ChildItem -Recurse -Attributes !Directory |
    Where-Object {$_.GetAccessControl().Owner -Notlike '*Administrators' } |
    Select-Object DirectoryName,Name,Length,@{Name='Owner';Expression={$_.GetAccessControl().Owner}}