$sourceFilePath = "C:\path\to\your\largefile.txt"
$outputDirectory = "C:\path\to\output"
$linesPerFile = 1800  # Number of lines per chunk

# Read the file and split it into chunks
$fileContent = Get-Content $sourceFilePath
$totalLines = $fileContent.Count
$numberOfFiles = [math]::Ceiling($totalLines / $linesPerFile)

for ($i = 0; $i -lt $numberOfFiles; $i++) {
    $startLine = $i * $linesPerFile
    $endLine = $startLine + $linesPerFile - 1
    if ($endLine -ge $totalLines) { $endLine = $totalLines - 1 }
    
    $fileContent[$startLine..$endLine] | Set-Content (Join-Path $outputDirectory ("Chunk_" + $i + ".txt"))
}