I'm on 64-bit Windows 8.1.

There is one .xml file in "C:\Program Files (x86)\Steam\steamapps\common\The Divinity Engine 2" called config.xml, here are the contents:

<?xml version="1.0" encoding="utf-8"?>
<config xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<RenderShadowProxies>true</RenderShadowProxies>
<AutoReloadAIGrid>false</AutoReloadAIGrid>
<CullRatio>0</CullRatio>
<AssertsEnabled>false</AssertsEnabled>
<OpenMessagePanelOnError>true</OpenMessagePanelOnError>
<MaxCommandHistory>40</MaxCommandHistory>
<MemoryTiming>1</MemoryTiming>
<TextureAtlasIconPath />
<DataPath>C:\Program Files (x86)\Steam\steamapps\common\Divinity Original Sin 2\Data</DataPath>
<DisplayExtraInfo>false</DisplayExtraInfo>
<UseMinimalChecks>true</UseMinimalChecks>
<UseP4>false</UseP4>
<LoadModuleCache>false</LoadModuleCache>
<LoadLevelCache>false</LoadLevelCache>
<DeveloperPermissions>true</DeveloperPermissions>
<FileVersion>1</FileVersion>
</config>

Not sure if it helps but there are also two files with references to "XML" in their title:

Xceed.Wpf.AvalonDock.XmlSerializers.dll
System.XML.dll