You can repair your corrupt RAR file manually. It is not a big process, it involves very easy steps. The steps are:
- Open WinRAR application
- Click on file, and then select open
- A find archive window will be opened, select corrupt zip file from your system
- Click on open button
- Press Alt+R
- Repairing File Name.zip will be opened
- Click on browse to save repaired file at desired location
- Check Treat the corrupt archive as ZIP box, and then click OK
- After corrupt ZIP archive is repaired, click on close.
If your file is highly corrupted and you need to use software then you can use additional software. I am recommending because i have used software to repair my PDF file. My PDF file got corrupted due to virus attack.