Mame short names to Long Symlinks

function createSymbolicLinks ($source, $destination, $hash, [switch]$overwrite) {
    $i = 0
    Write-Host "Creating symbolic links of $source at $destination..."
    if (!(Test-Path $destination)) {
        New-Item -ItemType Directory -Force -Path $destination > $null
    }
    $processedChild = @()
    Get-ChildItem -path $source -recurse | % {
        if (!$_.PSIsContainer){
            $matched = 0
            $destPath = $_.Fullname -replace [regex]::Escape($source), $destination
            $parentFolderPath = Split-Path $destpath -Parent
            $parentFolder = Split-Path $parentFolderPath -Leaf
            #MESS folder names match the hash XML file names
            $platform = Split-Path $parentFolder -Leaf
            #test for valid XML file
            if (Test-Path -LiteralPath $hash$platform.xml){
            #read the XML file, get the record matching the basename (filename without ext)
            $MameXML = [xml](Get-Content $hash$platform.xml -encoding UTF8)}
            $sourceRom = $_.basename
            $sourceXML = $MameXML.softwarelist.software | Where-Object {$_.name -eq "$sourceRom"}
            #american parents preferred
            if (!($sourceXML.cloneof.length -gt 0) -and ($sourceXML.description -match '\(.*?USA.*?\)')) {
                $matched = 1
                $processedChild += $sourceRom
            } elseif (!($sourceXML.cloneof.length -gt 0)) {
                #if you are a parent but have no american children, you are our next preference
                $romChildrenUSA = $MameXML.softwarelist.software | Where-Object {(($_.cloneof -eq "$sourceRom") -and !($sourceXML.description -match '\(.*?USA.*?\)'))}
                if ($romChildrenUSA.count -eq 0){
                    $matched = 1
                    $processedChild += $sourceRom
                }
            } elseif (($sourceXML.cloneof.length -gt 0) -and ($sourceXML.description -match '\(.*?USA.*?\)') -and !($sourceXML.description -match '\(.*?[dD]emo.*?\)|\(.*?[pP]rototype.*?\)|\(.*?[dD]ebug.*?\)|\(.*?[rR]ipped.*?\)') -and ($processedChild -notcontains $sourceXML.cloneof)) {
            $romParentUSA = $MameXML.softwarelist.software | Where-Object {(($_.name -eq "$sourceXML.cloneof") -and !($sourceXML.description -match '\(.*?USA.*?\)'))}
            #american non demo/proto/debug/rip child with non US parent that has not had any other siblings processed
                if ($romParentUSA.count -eq 0) {
                    $matched = 1
                    $processedChild += $sourceXML.cloneof
                }
            }
            if ($matched -eq 1){
                $destDesc = $sourceXML.description
                $illegalchars = [string]::join('',([System.IO.Path]::GetInvalidFileNameChars())) -replace '\\','\\'
                $destDesc = $destDesc -replace "[$illegalchars]",''
                $sourceExtension = $_.extension
                $destPath = "$parentFolderPath\$destDesc$sourceExtension"
            }
            if (!(Test-Path -LiteralPath $parentFolderPath)) {
                New-Item -ItemType Directory -Force -Path $parentFolderPath > $null
            }
            #overwrite dest files, if requested and needed
            if((Test-Path -LiteralPath $destpath) -and $overwrite -and $matched) {
                Remove-Item $destpath > $null
                cmd /c mklink `"$destpath`" `"$($_.FullName)`" > $null
                if ($LastExitCode -eq 0){
                    Write-Host -NoNewline "."
                    $i += 1
                } else {
                    Write-Host "Error creating link source:$(_.FullName) dest:$destpath"
                }
            } elseif (!(Test-Path -LiteralPath $destpath) -and $matched) {
                cmd /c mklink `"$destpath`" `"$($_.FullName)`" > $null
                if ($LastExitCode -eq 0){
                    Write-Host -NoNewline "."
                    $i += 1
                } else {
                    Write-Host "Error creating link source:$(_.FullName) dest:$destpath"
                }
            }
        }
    }
    write-host "`n"
    Write-Host "Created $i symbolic links at $destination."
}
#NB! Destination must be a LOCAL NTFS volume. -overwrite overwrites. Trailing slashes are important. MKLINK needs admin.
createSymbolicLinks -source "Z:\Mess\Roms\" -hash "D:\MAME\0.180\hash\" -destination "D:\Roms\Links\Mess\"
write-host "`n"
Write-Host "All done. Press any key to exit ..."
$x = $host.UI.RawUI.ReadKey("NoEcho,IncludeKeyDown")