Error "Selected file is not a valid iso file"

[Amigo1982]

A few hours i have a problem.
Just want to make Windows 10 live USB "Windows portable USB"
Using the only one program, which i know can do that Win to USB
I have 3 iso files, absolutely normal iso files, one of them downloaded from Microsoft.
Open file into the program have a message "Selected file is not a valid iso file"
Tried with Power iso software but free version cant convert a file bigger than 300Mb.
Excuse my poor english.
Tried with Img Burn to convert-again that error.
Please help!!!

 

[USAFRet]

Unclear of what you are actually doing.

If you are trying to make a bootable USB for a Win 10 install, go here: https://www.microsoft.com/en-us/software-download/windows10

If you are trying to do something else, what might that be?

 

[SkyNetRising]

Using the only one program, which i know can do that Win to USB

Try it with rufus:
http://rufus.akeo.ie/

 

[Mr Hat]

USAFRed's answer is the right, had exactly the same issue, and that's the solution, good luck!

 

[Amigo1982]

Thanks, but my question is how to resolve the problem with Windows To Go program.
And i see no solution on the link from "USAFRet", i downloaded Win Media Creator, open it and run to the end and i see no file ready to be burned to iso file.
I want to make Windows live USB (portable), not just bootable USB.
I'm sure the iso files are valid. Will try with Rufus if can't make it with Windows To Go.
How to convert the iso file to stop thaht message "error iso file is not valid"
First i tried to do that on Win 10 Enterprice "Windows To Go cant be used on Enterprice version", after that on Win 10 Pro and see that error with each iso file.
But i'm happy that with Rufus can be done portable Windows USB, just must slect "Windows To Go" instead "Standart Windows Installation" and must have at least 32Gb USB.

 

[USAFRet]

OK. What I posted was how to create a bootable install USB, not Windows To GO.

For that, see here: https://www.microsoft.com/en-us/download/details.aspx?id=48127

 

[Amigo1982]

OK.
This was helpfull, because it looks the USB drive must be certified, not each USB, biggest than 32Gb and must mount the iso before use it, so i wll do this and if works will mark as solution.
And it looks with my Win 10 Enterprice i can do that without additional programs.
Thank you.