Always run a security scan using Microsoft Defender or Malwarebytes before opening extracted .exe files.
Drag the extracted .zip files (do not unzip individual mod files) into this folder.
Do you have the (part2, part3, etc.) of this archive downloaded in the same folder? Farming Simulator 17 | How To Install Mods and Maps
Use a tool like WinRAR or 7-Zip . Right-click on part1.rar and select "Extract Here." The software will automatically pull data from the subsequent parts to recreate the full original file.
Because this is labeled "part1," it is likely followed by other files (e.g., part2.rar, part3.rar).