I am trying to write a .iso file to a USB flash drive to be used to install 
Windows 10 onto a PC with a blank HDD.

I've downloaded the 5.27GB 64bit Windows10.iso file (twice) from microsoft.com 
<http://microsoft.com/>, but when I use DiskUtility.app to "restore" the .iso 
file to the flash drive (formatted as ExFAT & GUID), it always errors out with: 
"Could not validate source - invalid argument". It sounds like it's trying to 
parse the .iso file and can't (the .iso isn't corrupted). This is the behavior 
on both Mojave and Catalina.

Is there any other way I can do this on a Mac, or do I have to hunt down 
another Windows PC?

-Carl

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