Windows 8.1 Error : The Selected file is not a valid ISO file. Please select a valid ISO file and try again, while creating a bootable Windows 8.1 USB device [Solved]

Here you find a powershell script which was very useful for me.
All scripts are free of charge, use them at your own risk :

You can use the Windows 7 USB/DVD Download tool, to create a Windows 7 / Windows 8 / Windows 8.1 bootable USB device.

You can download it here

Unfortunately sometimes you receive an error :

The Selected file is not a valid ISO file. Please select a valid ISO file and try again.

This error means that the ISO file is not fully compatible with the standard.

An ISO file consists of 3 things:

1. ISO 9660
2. Joliet
3. UDF

To solve this problem you can use PowerIso

Open PowerISO

Open the ISO file: File => Open => browse for the iso, and click open

Click on file => Image Properties

Select all 3 options : ISO 9660 / Joliet / UDF => click OK

Click File => Save

Click Yes on the question to overwrite the existing file.

Wait a while.

You can now close PowerISO and retry Windows 7 USB/DVD Download tool

Select your Windows 8.1 ISO file via Browse => click Next

Select ‘USB Device’

Select the correct USB Device and click ‘Begin Copying‘

Select ‘Erase USB Device’

Click Yes, to erase the USB Device

Wait until the copying is ready, and enjoy you Windows 8.1 installation !

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