Windows:
1. **Download Compression Software**: If you don't already have file compression software installed on your computer, you can download and install software like WinRAR or 7-Zip.
2. **Locate the RAR File**: Navigate to the location of the RAR file on your computer.
3. **Extract the Contents**: Right-click on the RAR file and select "Extract here" or "Extract files" from the context menu. This will extract the contents of the RAR file to the same location.
4. **Access the Extracted Files**: Once the extraction process is complete, you can access the extracted files in the same folder where the RAR file was located.
### Mac:
1. **Download Compression Software**: If you don't already have file compression software installed on your Mac, you can download and install software like The Unarchiver or Keka from the Mac App Store.
2. **Locate the RAR File**: Navigate to the location of the RAR file on your Mac.
3. **Extract the Contents**: Double-click on the RAR file to open it with the compression software you installed. The software will automatically extract the contents of the RAR file to a new folder in the same location.
4. **Access the Extracted Files**: Once the extraction process is complete, you can access the extracted files in the new folder created by the compression software.
### Online:
1. **Use Online Extraction Tools**: There are several online services that allow you to extract the contents of RAR files without installing any software on your computer. Simply upload the RAR file to the online service, and it will extract the contents for you. Some popular online extraction tools include Extract.me, Unzip-Online, and B1 Online Archiver.
2. **Download Extracted Files**: After the extraction process is complete, you can download the extracted files to your computer and access them like any other files.
By following these steps, you can easily open and extract the contents of RAR files on Windows, Mac, or online platforms.