Powershell to download files with certain name - powershell

Question

Hello and thank you in advance. Currently I have a script running that downloads files from one location to another. I'm trying to clean up the script to only download files that have _Lthumb in the file name. Any help would be greatly appreciated.
The following line in which I added is causing the problems. Wheni remove it, the script runs fine, but it doesn't filter the data by _Lthumb:
| Where-Object {$_.Name -Match '*_Lthumb'}
Here is the script, including the portion above that breaks it:
if((Get-PSSnapin | Where {$_.Name -eq "Microsoft.SharePoint.PowerShell"}) -eq $null) {
Add-PSSnapin Microsoft.SharePoint.PowerShell;
}
######################## Start Variables ########################
$destination = "\\pulse-dev.hinshawad.com\C$\ProfilePhotos\ProfilePictures"
$webUrl = "http://mysites.hinshawad.com"
$listUrl = "http://mysites.hinshawad.com/user photos/profile pictures/"
##############################################################
$web = Get-SPWeb -Identity $webUrl
$list = $web.GetList($listUrl)
function ProcessFolder {
param($folderUrl)
$folder = $web.GetFolder($folderUrl)
foreach ($file in $folder.Files | Where-Object {$_.Name -Match '*_Lthumb'} ) {
#Ensure destination directory
$destinationfolder = $destination + "/" + $folder.Url
if (!(Test-Path -path $destinationfolder))
{
$dest = New-Item $destinationfolder -type directory
}
#Download file
$binary = $file.OpenBinary()
#$stream = New-Object System.IO.FileStream($destinationfolder + "/" + $file.Name), Create
$stream = New-Object System.IO.FileStream($destinationfolder + "/" + ($file.Name -replace "_Lthumb")), Create
$writer = New-Object System.IO.BinaryWriter($stream)
$writer.write($binary)
$writer.Close()
}
}
#Download root files
ProcessFolder($list.RootFolder.Url)
#Download files in folders
#foreach ($folder in $list.Folders) {
#ProcessFolder($folder.URL)
#}