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# Load
[xml]$XmlContent = (get-content $PathToXmlFile)

# Manipulate
$XmlContent.Content.Attribut1 = $Value

# Save
$XmlContent.Save($PathToXmlFile)

# convert to utf8
(Get-ChildItem "test.csv") | %{if((Get-FileEncoding $_) -ne "UTF8"){Set-Content (Get-Content $_) -Encoding utf8 -Path $_}}

# export csv file
$Content | Export-Csv "test.csv" -Delimiter ";" -Encoding "UTF8" -NoTypeInformation

# import csv file
$Content = Import-CSV "test.csv" -Delimiter ";"