Herestring

$SaveLocation = 'C:\answerfile.txt'
$HostName = (Get-WmiObject win32_computersystem).DNSHostName
$Hostid = (Get-WmiObject win32_networkadapterconfiguration -filter "IPEnabled='True'" | Select-Object -Property macaddress).macaddress

$text4msi = @"
<EventCollectorConfig log_level="diag|debug|warn|info|err" log_size="20971520">
<receiver ip="xxx.xxx.xxx.xxx" port="xxxx" use_ssl="yes" />
<credentials user="" pass="" b64pass="" domain="" />
<host name="$HostName" ip="" use_parent_logging="yes" log_level="diag|debug|war
n|info|err" use_parent_credentials="yes|no">
<credentials user="" pass="" domain="" />
<plugin hostid="$Hostid" name="" type="win_evt ">
<config key="" value="" />
</plugin>
</host>
</group>
</EventCollectorConfig>
"@

Set-Content -Path $SaveLocation -Value $text4msi -Force