Look for a .pdf or .txt file inside; if it contains a .exe and you weren't expecting software, do not run it .
Use a utility like 7-Zip or WinRAR to open the .rar extension. 55136.rar
This specific archive often contains the "White E92 M3 Catalogue" or high-resolution press release materials for the BMW E92 M3 sedan and coupe. Look for a