If you frequently mod, keep a clean backup of the entire \update\x64\dlcpacks\ folder on an external drive. This way, you can restore any original .rpf without re-downloading 90+ GB of game data.
If you own a legal copy of GTA V, follow these steps : Update X64 Dlcpacks Mpchristmas2017 Dlc.rpf Download
To use this file in a modded environment, you typically need , a popular tool for opening and editing GTA V OpenIV Setup : Download to access the contents of the The "mods" Folder If you frequently mod, keep a clean backup