Since these files are usually in .rar format, you will need a specific utility to extract them:
: The standard tool for .rar files, available from RARLAB .
Always scan downloaded .rar files from automotive forums for malware. Many of these tools (like INPA) require a specific K+DCAN USB cable to interface with your E53's OBD-II port. rar files, someone please help - Bimmerpost