The ".rar" extension indicates that these style files have been bundled together into a single, compressed "Roshal Archive" to make them easier to download and share. 2. How to Open and Use the Content

If you are interested in the technical side of why files use the RAR format, here are the key benefits: Need to open, create, or convert a RAR file? - WinZip

Once extracted, you will likely see files with extensions like .sty , .prs , or .sst , depending on the target instrument.