The .part1 suffix signifies that the full game installer was split into multiple smaller files (likely due to file size limits on hosting services). You must have all parts (e.g., part2, part3, etc.) in the same folder to successfully extract the game.
Files with this naming convention found on third-party sites or file-sharing platforms are often associated with unofficial distributions. To ensure your account and system security, it is highly recommended to download the game exclusively through the Official Escape from Tarkov Website and its dedicated launcher, BsgLauncher . Escape.from.Tarko.v 0.12.9.10532.part1.rar
This patch accompanied a full progression reset (wipe), which is a standard event in the game's development cycle to test new economy and leveling balance. To ensure your account and system security, it
Introduction of the KRISS Vector, SIG MCX, and various new rigs and backpacks. and various new rigs and backpacks.
The .rar extension indicates the file is compressed. You would need a utility like WinRAR or 7-Zip to extract it.