64637: Acronis Cyber Backup 12.5: WinPE bootable media creation fails with "The user attempted to mount to a directory that is not empty. This is not supported."

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Symptoms

1. You installed Bootable Media Builder and appropriate Windows AIK/ADK for creating WinPE media.

2. WinPE media creation fails with the following error:

The user attempted to mount to a directory that is not empty. This is not supported.  

Cause

Folder C:\Users\%username%\AppData\Local\Temp\~MntWIM that is used to store temporary mounted .wim image is not empty. 

Solution

Delete or rename C:\Users\%username%\AppData\Local\Temp\~MntWIM folder, then reattempt WinPE media creation.

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