To get a better grasp of this, do note that these issues usually are the result of RAR file corruption, CRC errors, virus attacks, and not only.
Therefore, instead of imaging the worst-case scenarios, follow our detailed troubleshooting tips below.
How to fix The archive is either in unknown format or damaged?
1. Give a try to WinZip
Before proceeding with the actual solutions, do consider that the issue could be a result of a temporary or even permanent glitch of WinRAR itself.
You’ve seen that the message The archive is either in unknown format or damaged pops up unexpectedly and leads to a supposed corruption of the RAR file.
Since you experience this issue within WinRar, do consider opening the archive with WinZip this time. Navigation is straightforward, with the guarantee to easily unzip all major file formats.
Moreover, the interface easily adjusts to suit touchscreen devices, while you can connect to Dropbox, Google Drive, and not only, in order to work smoothly on the go or at the office.
Users often report getting errors about unknown format or damaged archives. Install WinZip to easily correct them!
2. Run a malware scan using Vipre
It’s not uncommon to discover that severe malware attacks lead to corrupt RAR files. Your antivirus usually plays a vital role in the security of your data and handsets.
If the issue is indeed caused by a virus infection or anything similar, it’s time to think of using an award-winning antivirus such as Vipre.