An autounattend.xml file is a "Windows Answer File" that provides preconfigured values to the Windows Setup engine. Unlike a standard unattend.xml , which is typically used for image deployment (via MDT or ConfigMgr), an autounattend.xml is specially named so that Windows Setup automatically searches for it on removable media like USB drives or ISO roots during boot.

Microsoft provides free, official tools to generate exactly the file you need:

Ensure the ADK is installed. This provides necessary tools like Windows System Image Manager (WSIM).

Since every installation requires different settings (e.g., bypassing TPM checks or creating specific local accounts), you typically a custom file rather than downloading a generic one. 1. Generate Your Custom XML

Run scripts to remove unwanted pre-installed apps. Best Ways to Download or Generate Your File