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<blockquote data-quote="pstein" data-source="post: 742602" data-attributes="member: 36066">I have an UEFI-based ISO file for a tool on windows (This tool is NOT a WinOS but a separate utility tool).If I burn this ISO onto a DVD and boot it on an UEFI computer (without Secure Boot) everything works.However If I put this ISO with e.g. Rufus onto an USB flash drive then the USB flash drive does not boot and show an error message:&quot;Could not locate 'EFI\boot\bootx64.efi': Not foundYes, the file and the directory is missing.After a long search I found a hint:Surprisingly a DVD-bootable ISO is NOT automatically bootable from USB flash drive due to different handling of Bootmanager.Interesting. I have not expected that.Now my problem is: Can I convert this only-on-DVD-bootable ISO to a bootable-from-USB-flash-drive ISO?Alternatively it would be acceptable to create at first an UEFI-bootable USB flash drive and extract (which?) tool files out of the ISO onto this USB flash drive. I guess I have to declare (where?) what program should be started during USB flash drive boot.Any suggestions?E.g.Ventoy does not help.It must be a solution which prepares the USB flash drive for simple UEFI boot and let me add (before or afterwards) an additional tool.Peter</blockquote>

[QUOTE="pstein, post: 742602, member: 36066"] I have an UEFI-based ISO file for a tool on windows (This tool is NOT a WinOS but a separate utility tool). If I burn this ISO onto a DVD and boot it on an UEFI computer (without Secure Boot) everything works. However If I put this ISO with e.g. Rufus onto an USB flash drive then the USB flash drive does not boot and show an error message: "Could not locate 'EFI\boot\bootx64.efi': Not found Yes, the file and the directory is missing. After a long search I found a hint: Surprisingly a DVD-bootable ISO is NOT automatically bootable from USB flash drive due to different handling of Bootmanager. Interesting. I have not expected that. Now my problem is: Can I convert this only-on-DVD-bootable ISO to a bootable-from-USB-flash-drive ISO? Alternatively it would be acceptable to create at first an UEFI-bootable USB flash drive and extract (which?) tool files out of the ISO onto this USB flash drive. I guess I have to declare (where?) what program should be started during USB flash drive boot. Any suggestions? E.g.Ventoy does not help. It must be a solution which prepares the USB flash drive for simple UEFI boot and let me add (before or afterwards) an additional tool. Peter [/QUOTE]

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