@flat4vw I guess a couple of things.

Instead of realtek.pxe you probably want to use realtek.kpxe.

The *?pxe files are for bios based computers. They will not boot on a uefi system.

The file is physically located in the FOG server in the /tftpboot directory.

How do you make the computer load the file? Update dhcp option 67 on your dhcp server. Either by the windows dhcp manager or if linux in /etc directory.

I figured it out, I updated to the latest trunk with this guide: https://wiki.fogproject.org/wiki/index.php?title=Upgrade_to_trunk

Now the Problem is solved, also new NICs are able to mount properly!

You guys are great 🙂