864_rp.rar

Depending on where you found the file, "864_RP" likely refers to:

: You can use the official WinRAR tool to right-click the file and select "Extract Here". Alternatively, free tools like 7-Zip or WinZip are compatible. 864_RP.rar

: Use The Unarchiver or similar utilities available on the App Store. Potential Contexts for "864_RP" Depending on where you found the file, "864_RP"