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#40
No, you don't need wim file. In fact you can completely remove CPI source reference from answer file, the highlighted part:
If you have a preinstalled OEM Windows I recommend to restore a system image and forget this procedure, some OEM installations have other measures in place preventing successful sysprep.<?xml version="1.0" encoding="utf-8"?><unattend xmlns="urn:schemas-microsoft-com:unattend">
<settings pass="specialize">
<component name="Microsoft-Windows-Shell-Setup" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS" xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<CopyProfile>true</CopyProfile>
</component>
</settings>
<cpi:offlineImage cpi:source="wim:X:/sources/install.wim#Windows 10 Pro" xmlns:cpi="urn:schemas-microsoft-com:cpi" />
</unattend>
If Windows is clean installed by you, you have two options: either re-install or restore a system image and try again, or re-install and forget this procedure.
Kari