It included "Initial implementation of the character's skill "Immunity"" and various optimization passes. File Characteristics
Version 0.12.9 was a major update released in late 2020. Key features of this era included: Escape.from.Tarko.v 0.12.9.10532.part1.rar
Version 0.12.9.10532 is now several years old. Since Escape from Tarkov is an online-only "beta" game, older client versions generally cannot connect to official live servers. Security Warning It included "Initial implementation of the character's skill
The .rar extension indicates the file is compressed. You would need a utility like WinRAR or 7-Zip to extract it. Escape.from.Tarko.v 0.12.9.10532.part1.rar