Kill app on remote computer using powershell, then replace files

kill_and_fix_our_custom_app.ps1

#get the list of servers to tackle
foreach ($Server in Get-Content "C:\UpdateUsers.txt")
#now do each server 
{
#making a \\server and server variable
$server2 = $Server -replace ("\\","")

#Which server is it updating
Write-host "Working on $Server2"

#Killing the App
#get the app info and assign that object to the variable.  Then we can use methods on it.
#could also use gwmi -query "select * from win32_process where name = 'outcustomapp.exe'" -computername $server2
$processes = Get-WmiObject -Class Win32_Process -ComputerName $server2 -Filter "name='ourcustomapp.exe'"

#using the WMI methods to terminate and get the PID. We iterate since people can have multiple instances running
foreach ($process in $processes) {
  $returnval = $process.terminate()
  $processid = $process.handle

if($returnval.returnvalue -eq 0) {
  write-host "The process $ProcessName `($processid`) terminated successfully"
}
else {
  write-host "The process $ProcessName `($processid`) termination has some problems"
}
} 

#set variables to replace the files, both current and backup
$oldfile = $Server + "\" + "c"+"$"+"\ourcustomapp\config.xml"
$newfile = $Server + "\" + "c"+"$"+"\ourcustomapp\config_backup.xml"

$oldfile2 = $Server + "\" + "c"+"$"+"\ourcustomapp\config2.xml"
$newfile2 = $Server + "\" + "c"+"$"+"\ourcustomapp\config2_backup.xml"


#Backup / Update file; check if file is there.  If so, modify.
if (test-path $oldfile) {
copy-item $oldfile $newfile
(get-content $oldfile) -ireplace ('oldservername','newshinycname') | out-file $oldfile
}  

#Backup / Update file; check if file is there.  If so, modify.
if (test-path $oldfile2) {
copy-item $oldfile2 $newfile2
(get-content $oldfile2) -ireplace ('oldservername','newshinycname') | out-file $oldfile2
}  

}