PowerShell Copy Biggest (file size) File to Destination

Question

Hi guys, 
I have the following code, works butter smooth. Copies a few files/folders from source to destination then applies ACL's. See that 3rd "copy-item"
which gets a .nk2 and copies it over? Well in the source there are MULIPLE .nk2 files (with different names), how can I get it to scan that \outlook folder and copy the biggest (file size) .nk2 item and rename is outlookprofile.nk2?
gc folderlist.txt | % {
$user = "$_"
Import-Csv "C:\TEMP\Favorites\input.csv" | ForEach {
If ($_.FQDN -eq $env:USERDNSDOMAIN) { $file_server = $_.'Server IP' }
$FavAcl = Get-Acl -path \\$file_server\profiles$\$user\Favorites\
$SigAcl = Get-Acl -path "\\$file_server\profiles$\$user\Application Data\Microsoft\Signatures\"
if (Test-Path -Path "\\$file_server\profiles$\$user\Favorites")
copy-item -path \\$file_server\profiles$\$user\Favorites -destination \\$file_server\userhome$\$user\Favorites -recurse -force
copy-item -path "\\$file_server\profiles$\$user\Application Data\Microsoft\Signatures" -destination \\$file_server\userhome$\$user\AppData\Roaming\Microsoft\Signatures\ -recurse -force -ErrorAction SilentlyContinue
copy-item -path "\\$file_server\profiles$\$user\Application Data\Microsoft\Outlook\outlook.nk2" -destination \\$file_server\userhome$\$user\AppData\Roaming\Microsoft\Outlook\outlook.nk2 -ErrorAction SilentlyContinue
Get-ChildItem -path \\$file_server\userhome$\$user\Favorites -Recurse -Force | Set-Acl -AclObject $FavAcl
Get-ChildItem -path \\$file_server\userhome$\$user\AppData -Recurse -Force | Set-Acl -AclObject $SigAcl
Get-Acl -path \\$file_server\profiles$\$user\Favorites\ | Set-ACL -path \\$file_server\userhome$\$user\Favorites\
Get-Acl -path "\\$file_server\profiles$\$user\Application Data\Microsoft\Signatures\" | Set-Acl \\$file_server\userhome$\$user\AppData\
remove-item -path \\$file_server\profiles$\$user -recurse -force
I'll need it to keep the ACL from source to destination as well.
Thanks guys.

Answer 1

get-childitem "\\$file_server\profiles$\$user\Application Data\Microsoft\Outlook\*.nk2" | sort -property Length -descending | select -first 1 | %{
copy-item $_ -destination "\\$file_server\userhome$\$user\AppData\Roaming\Microsoft\Outlook\outlook.nk2" -ErrorAction SilentlyContinue
Get-ACL $_ | Set-ACL -path "\\$file_server\userhome$\$user\AppData\Roaming\Microsoft\Outlook\outlook.nk2"
Give this a whirl, hope it helps!
Not quite sure I follow what you're trying to do with renaming, but this should get you far enough to sort that bit yourself.  If not, please clarify.