Edit1: I have rewritten the iso file on the USB key with etcher.io (an electron app running on Linux,Windows and Mac):
https://etcher.io/ and it works fine that way.
End Edit1
Edit2: This is a BIOS computer, NOT a UEFI. End Edit2
Edit3v2: Rufus 2.18 (latest), I believe rufus change the boot to Syslinux (I have checked syslinux.cfg file before etcher.io)...
I believe original file is GRUB(2)... when reading in Windows, I was only seeing grub directory, not syslinux after etcher.io write.
End Edit3v2
I used Rufus to 'burn' the MX-17.1-RC1_x64.iso file on a 4GB usb key.
It asked permission to download 2 files from Internet before writing it, but it had seems to worked.
I have chosen Fat32.
But when I booted, it said me that the file KERNEL /antiX/vmlinuz
was missing and it is indeed missing:
E:\>dir
Le volume dans le lecteur E s'appelle ANTIXLIVE
Le numéro de série du volume est D0E5-D138
Répertoire de E:\
2018-03-08 19:23 <REP> EFI
2018-03-08 19:23 <REP> antiX
2018-03-08 19:28 <REP> boot
2018-03-08 19:28 894 cdrom.ico
2018-03-08 19:28 38 version
2018-03-08 19:28 104 syslinux.cfg
2018-03-08 19:28 216 autorun.inf
2018-03-08 19:28 34 494 autorun.ico
5 fichier(s) 35 746 octets
3 Rép(s) 3 050 479 616 octets libres
E:\>cd antiX
E:\antiX>dir
Le volume dans le lecteur E s'appelle ANTIXLIVE
Le numéro de série du volume est D0E5-D138
Répertoire de E:\antiX
2018-03-08 19:23 <REP> .
2018-03-08 19:23 <REP> ..
2018-03-08 19:23 6 597 690 initrd.gz
2018-03-08 19:23 44 initrd.gz.md5
2018-03-08 19:23 848 297 984 linuxfs
3 fichier(s) 854 895 718 octets
2 Rép(s) 3 050 479 616 octets libres
E:\antiX>