Here is what you should know about this file and how to handle it safely:
Files named .part1.rar , .part2.rar , etc., must all be downloaded into the same folder. You only need to extract the first file ( .part1 ) using software like WinRAR or 7-Zip , and it will automatically combine all parts. Budowa.Symulatora.Extended.Edition.part1.rar
I can provide more specific instructions if I know the issue. Here is what you should know about this