The process to extract content from the game can be pretty tricky. The exact process for every game will be different, and some games are so locked down that you have to rip the data directly from the video card while it’s being rendered. It pays to do a lot of research because there is almost always some tool that some person or group has developed to assist extracting the content.
Bethesda Games run on their own proprietary game engine, and the fan community has created a handful of tools you can use to extract the game content. The main programs we use for this are the Bethesda Archive Extractor to extract models and textures from the game’s content archive, and NifSkope which will load the extracted content and convert it into a format we