To open or extract a .rar file on a Mac running OS X, you can use the following steps:
- Install a third-party extraction tool that supports RAR files. Two popular options are The Unarchiver and StuffIt Expander. Both of these tools can be downloaded for free from the Mac App Store.
- Once you have installed an extraction tool, locate the .rar file that you want to extract.
- Double-click on the .rar file to open it in the extraction tool.
- In the extraction tool, select the destination folder where you want to extract the contents of the .rar file.
- Click on the “Extract” or “Unpack” button to extract the contents of the .rar file to the destination folder.
Note that some .rar files may be password-protected. If you encounter a password-protected .rar file, you will need to enter the password in the extraction tool to extract the contents.
Also note that newer versions of Mac OS X have built-in support for extracting .zip files, but do not have built-in support for extracting .rar files. Therefore, you will need to use a third-party extraction tool as described above to extract .rar files on a Mac running OS X.