Update X64 Dlcpacks Mpchristmas2017 Dlcrpf [portable] Free
The phrase seems to refer to an update for GTA V, specifically targeting the 64-bit version of the game, involving DLC packs that might have been released around Christmas 2017. Given that GTA V regularly receives updates, especially for its online multiplayer component (Grand Theft Auto Online), it's plausible that this update added holiday-themed content, missions, or items.
Appendix
[Insert Link if hosting a file] Credits: Rockstar Games / OpenIV Team update x64 dlcpacks mpchristmas2017 dlcrpf free
Now go enjoy a snowy Los Santos. Happy modding, and merry Christmas! The phrase seems to refer to an update