PowerShell script to search for files with names that won't work on an original Xbox FATX filesystem

Get-InvalidFatxFilenames.ps1

param (
    [Parameter(Position = 1)]
    [ValidateScript({ Test-Path $_ -PathType Container })] # Ensures the provided folder path exists
    [string]
    $TargetDir
)

$maxLength = 42
$invalidChars = '[^ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789!\#\$\%\&\''\(\)\-\.\@\[\]\^_`\{\}~ ]'

# Recursively get all files in the directory
Write-Host -ForegroundColor Cyan "Enumerating files in $((Get-Item -Path $TargetDir).FullName)..."
$files = Get-ChildItem -Path $TargetDir -Recurse -File -FollowSymlink
Write-Host -ForegroundColor Cyan "Checking $($files.Length) files..."

# Loop through each file and check its name
foreach ($file in $files) {
    $fileName = $file.Name

    # Check if file name is 42 or more characters long
    if ($fileName.Length -gt $maxLength) {
        Write-Output "Invalid length: $($fileName), Full Path: $($file.FullName)"
        continue
    }
    # Check if file name contains only valid characters
    if ($fileName -match $invalidChars) {
        Write-Output "Invalid chars: $($fileName), Full Path: $($file.FullName)"
        continue
    }
}

Write-Host -ForegroundColor Green "Done."