Not sure yet how to check if the value is already written in the file. But to
write it, you could use something like:
<ComponentGroup Id="ProductComponents" Directory="INSTALLFOLDER">
<Component Id="CMP_MyFileXML"
Guid="{05AB616A-AD9E-468B-AE86-477759234CA0}">
<File Source="MyFile.xml" KeyPath="yes" />
<util:XmlConfig Id="ConfigureMyFileXML"
File="[INSTALLFOLDER]MyFile.xml"
Action="create"
On="install"
Node="element"
Name="user"
ElementPath="//users"
Value="BDC" />
</Component>
</ComponentGroup>
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