Similar to the popular ZIP file compression format, the RAR format allows you to compress files to conserve storage space. One major advantage of RAR is its ability to compress files into multi-part storage containers. This is helpful when you need to upload the files or store an archive across several CDs. The disadvantage of RAR is Windows 7’s inability to access these container files. However, you can use the free, open-source 7-Zip utility to extract and rejoin the original files. Tips Writer Bio