The file path update/x64/dlcpacks/mpchristmas2017/dlc.rpf refers to the update for Grand Theft Auto V
To give you a more specific guide, are you trying to or install a specific mod (like a car or weapon)? Unable to launch GTA V after Doomsday Heist update Update X64 Dlcpacks Mpchristmas2017 Dlc.rpf