Large textures or "re-baked" (REB) game files.
Ensure you have every numbered file in the sequence (Reb1MF.7z.001, Reb1MF.7z.002, etc.) saved in the same directory. Reb1MF.7z.001
The .001 extension indicates this is the "header" or beginning of the sequence. Large textures or "re-baked" (REB) game files