If this follows the pattern of similar "DRS" archives, the file likely contains:
: A compressed file format. You will need a utility like WinRAR , 7-Zip , or The Unarchiver to extract the data inside. Security and Downloading Best Practices Download [BG31 074] DRSv17 0039 rar
: The specific item or volume number within that series. If this follows the pattern of similar "DRS"