Don't have Telegram yet? Try it now!
https://www.vspbreda.nl/nl/workstation-os/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/
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]