DacToFile.ps1

param($dacpacPath = 'c:\dacpacPath', $dacpac = 'your.dacpac')
add-type -path 'C:\Program Files (x86)\Microsoft SQL Server\120\DAC\bin\Microsoft.SqlServer.Dac.Extensions.dll'
cd $dacpacPath
$model =[Microsoft.SqlServer.Dac.Model.TSqlModel]::new(((get-item ".\$dacpac").fullname))
$queryScopes = [Microsoft.SqlServer.Dac.Model.DacQueryScopes]::All
$returnObjects = $model.GetObjects([Microsoft.SqlServer.Dac.Model.DacQueryScopes]::All)
$s = ''
foreach($r in $returnObjects)
{
   if ($r.TryGetScript([ref]$s))
   {
    $objectTypeName = $r.ObjectType.Name;
    $d="c:\temp\db\$objectTypeName"
    if(!(test-path $d ))
    {
        new-item $d -ItemType Directory
    }
    $filename = "$d\$($r.Name.Parts).sql"
		
		if (! (test-path $filename))
		{
			Try
			{
				new-item $filename -ItemType File -ErrorAction Stop -Force
			}
			Catch
			{
				$url = "$($r.Name.Parts)"
				if ([system.uri]::IsWellFormedUriString($url, [system.urikind]::Absolute))
				{
					$u = ([uri]"$url").Segments[-1]
					$filename = "$d\$u.sql"
					new-item $filename -ItemType File -ErrorAction Stop -Force
				}
				
			}
		}
		$s | out-file  $filename -Force
    write-output $filename
   }

}