FoliCon v4.0 uses different naming scheme of icon names, therefore deletion of old files or manual rename is necessary

migrateToFoliconv4.ps1

function Rename-FolderIcons {
    param(
        [string]$folderPath,
        [int]$depth = 0
    )
    
    $subDirectories = Get-ChildItem -Path $folderPath -Directory

    $totalDirs = $subDirectories.Count

    for ($i = 0; $i -lt $totalDirs; $i++) {
        $subDir = $subDirectories[$i]
        
        Write-Progress -Activity "Processing directories" -Status "$($subDir.FullName)" -PercentComplete (($i / $totalDirs) * 100) -Id $depth
        Rename-FolderIcons -folderPath $subDir.FullName -depth ($depth + 1)
    }

    # Check if desktop.ini files are there
    if (Test-Path "$folderPath\desktop.ini") {
        # Change the attributes to Normal
        attrib -S -H -R "$folderPath\desktop.ini"
        $desktopFileContent = Get-Content "$folderPath\desktop.ini"
        $iconFileName = [regex]::Matches($desktopFileContent[1], '(?<=IconResource=)[^\,]*', 'IgnoreCase').Value

        # If icon file with IconFileName exists, rename it and update desktop.ini 
        if (Test-Path "$folderPath\$iconFileName") {
            # Rename .ico file
            Rename-Item -Path "$folderPath\$iconFileName" -NewName "folicon.ico" -ErrorAction SilentlyContinue

            # Update IconResource in desktop.ini
            $desktopFileContent = $desktopFileContent -replace $iconFileName, 'folicon.ico'
            $desktopFileContent | Set-Content "$folderPath\desktop.ini"
            attrib +S +H "$folderPath\desktop.ini"
        }
    }
    
    if ($depth -eq 0) {
        Write-Progress -Activity "Processing directories" -Status "Done" -Completed
    }
}


# Check for command line arguments
if (!$args[0]) {
    # Get the current directory
    $currentDirectory = Get-Location

    # Ask the user if they want to proceed with the current directory
    $userInput = Read-Host "No directory path was provided. Would you like to proceed with current directory ($currentDirectory)? [y/n]"

    if ($userInput -eq "y") {
        # If user agrees, run the function with the current path
        Rename-FolderIcons -folderPath  ${currentDirectory.ToString()}
    } else {
        Write-Host "User input was not 'y'. Exiting."
    }
} else {
    # If argument is provided, run with it
    Rename-FolderIcons -folderPath $args[0]
}