Convert R81 to R13

Understanding R81 and R13 file formats

R81 and R13 are both file extensions associated with the RAR archive format, developed by Eugene Roshal. RAR files are commonly used for compressing and splitting large files into smaller parts for easier distribution. The extensions .r81 and .r13 indicate specific parts of a multi-volume RAR archive, with the numbers representing the sequence of the split files.

For example, a large archive may be split into files like file.part01.rar, file.r00, file.r01, ..., file.r81, and so on. These files are not standalone archives but parts of a whole, and require the complete set to extract the original data.

Why convert R81 to R13?

Technically, R81 and R13 are not different formats but different segments of a split RAR archive. There is no direct conversion between them, as each represents a specific part of the archive. However, if you need to rename or reorder parts due to missing or misnamed files, you can manually rename the files to match the expected sequence, ensuring the extraction process works correctly.

How to manage and extract multi-part RAR archives

To work with multi-part RAR archives (including .r81 and .r13 files), you need to:

1. Ensure you have all parts of the archive in the same folder.
2. Use a RAR-compatible extraction tool to open the first part (usually .rar or .part01.rar).
3. The extraction tool will automatically process the subsequent parts (.r00, .r01, ..., .r13, .r81, etc.) in order.

Best software for handling R81 and R13 files

• WinRAR (Windows): The official tool for RAR archives. Open the first part and extract the contents.
• 7-Zip (Windows): Free and open-source, supports multi-part RAR extraction.
• The Unarchiver (macOS): Popular for extracting RAR files on Mac.
• PeaZip (Windows, Linux): Another free tool supporting RAR archives.

To extract, use File → Open to select the first part, then Extract to retrieve the original files.

Summary

There is no direct conversion between R81 and R13 files, as they are both parts of a split RAR archive. Use a reliable extraction tool to handle the complete set of files and recover your data.