NTLite – Make bootable ISO Image file from your custom WIM
What is WIM and How to convert WIM to ISO or make a bootable ISO mage file from you custom WIM file with NTLite free software (portable version available)
Imaging
Rufus – Apply ISO Image file to USB Flash Media Drive
Rufus is a free (multilingual, portable) tool that can help you apply bootable ISO image to the USB Flash Drive with options variety (GPT, MBR, FAT32, NTFS)