To access its contents, you need an extraction tool like WinRAR , 7-Zip , or The Unarchiver .

Be cautious if you didn't expect this file; .rar files are frequently used to distribute software, but can also hide malware. 2. Biomedical Research (RAR in dl)

In a general computing context, is often a generic name for a downloaded file (where "DL" stands for "Download").