Add detection for unattend.xml file

[daboynb]

Checklist

• I looked at https://github.com/pbatard/rufus/wiki/FAQ to see if my question has already been answered.
• I performed a search in the issue tracker for similar issues using keywords relevant to my problem, such as the error message I got from the log.

Issue description

When a user provides an ISO file containing an unattend.xml file and uses Rufus, the software still prompts for unattended options.

This behavior will lead to this error

To address this issue, Rufus should include a check to determine if the unattend.xml file is already present.

If the file is found, Rufus should skip prompting for unattended options.

[pbatard]

Care to provide a log as was requested?

Yes, I understand your request, and I will consider it.

But I still very much would like to see the exact log that produced the error in your screenshot.

[daboynb]

Here the log, sorry.
rufus.log

Here the error :

Error: Could not create directory 'D:\sources\$OEM$\$$\Panther': [0x000000B7] Cannot create a file when that file already exists.