Write-UTF8File.ps1

function Write-UTF8File
{
	[CmdletBinding()]
	param
	(
		[Parameter(Mandatory = $true)]
		[System.IO.FileInfo]$FilePath,
		[Parameter(Mandatory = $true,
			ValueFromPipeline = $true)]
		[string[]]$String,
		[Parameter(Mandatory = $false)]
		[switch]$Force
	)
	begin
	{
		$Utf8NoBomEncoding = New-Object System.Text.UTF8Encoding $False
		if ($FilePath.Exists -and $Force)
		{
			$FilePath.Delete()
		}
	}
	process
	{
		if ($FilePath.Exists)
		{
			[System.IO.File]::AppendAllLines($FilePath.FullName, $String, $Utf8NoBomEncoding)
		}
		else
		{
			[System.IO.File]::WriteAllLines($FilePath.FullName, $String, $Utf8NoBomEncoding)
		}
	}
}