Creating a bootable memstick of Pfsense, create only two files

[executable]

I want to install the Pfsense OS on a server but when I try creating a bootable USB, I have only two files :

EFISYS (F:)
│
└───efi
    |   
    └───boot
        |   BOOTx64.efi    (384 Ko)
        |   startup.nsh    (1 Ko)

I'm using this image pfSense-CE-memstick-2.4.4-RELEASE-p1-amd64.img (748 Mo) and I use Rufus for creating bootable memstick. The memstick is 32 Go. I don't know if it's normal. Thank you for any help

[jimp]

That's just one slice. The actual installation files are on a separate partition on the memstick that can't be read by windows.