If you are using Linux Mint 17 and cannot open RAR files (they may appear empty or show an error), you likely need to install the non-free RAR module.
: WinRAR can often fix minor corruption if the creator included a "recovery record" during compression.
If "Fix 17 rar" refers to a file that is corrupted or won't extract, you can use built-in tools or third-party software to attempt a recovery.
: Sites like EasyZip or FabConvert offer free browser-based repair for smaller archives. 3. Fixing "Access Denied" or Verification Errors
Rar files automatically failing the download - Mozilla Support