"6.1" (often shortened in technical logs as 61rar) refers to a specific milestone in the software’s life cycle. Modern updates to WinRAR usually focus on:
Squeezing even more space out of your files than previous versions.
Improvements in recovery records , which help fix files if they get slightly corrupted during a download. How to Use 61rar Files
Right-click the file and select "Extract Here" to unpack the contents into a regular folder. The Bottom Line