How to repack .usm files?

I want to do something like Main Menu Video Replacement like the recent-released one at NEXUS.I’ve got my main_menu_ep1.usm file.Also,I’ve put it under movies\gui\menus\ directory as the author told.

However,when I put ‘movies’ folder into Modded folder and used ModKitchen to repack it,nothing happend:surprised2:.

I didn’t get a blob0.bundle.All I got is a useless metadata.store file.So I think I Should use some other mod tool to repack it.But which mod tool should I choose to repack it and how?

I’d really apperciate some help.:geraltsad:.Well guys please just show me a way to figure it out.

How to repack .usm files?