Large files are usually compressed for storage and transmission purposes. Compression allows for quick upload and download of files from the internet. Such compressed files are called archive files. There are many different archive file formats available among which .zip, .rar, .7z are most common.
Zip files use lossless compression technique, hence zipping or unzipping a file as such does not cause the loss of data. However, downloading these files from the internet may cause corruption. Some reasons why you cannot open the Zip files and potential solutions are described in this article.
- Header file inconsistencies
Due to the nature of open source format, it is possible to download a Zip file with a simple header issue. The Zip file has structure information in a file called Zip Note. Header file information should be similar in both the files. Any minor mismatch or incorrect extensions can cause corruption in the Zip file and you cannot open them. In order to solve this problem obtain a new copy of the file or download the Zip file again.
2. CRC Error
Another common error associated with Zip files is CRC error. CRC stands for Cyclic Redundancy Check. When a Zip file is created, WinZip calculates a CRC value for the file. Again when files are extracted, CRC value is calculated and the two values are compared. CRC error message is displayed when there is a mismatch in the two values. When this happens, invalid data is introduced into the file. To fix this problem, try downloading the Zip file again.
Sometimes downloading Zip files again does not help you solve the problem and extract Zip files. Or you may also encounter errors such as ‘Unexpected end of data’, ‘Not a valid archive’ or ‘cannot open Zip file, access denied’. In such cases, your file is probably severely corrupt. Third-party software like Remo Zip Repair tool is required to repair your corrupt file and extract contents. With this software, you can repair 7zip unexpected end of data error. Also, if you’re wondering as to how to repair Zip cannot a find local header, this software is useful for you. In addition, it can also repair Zip files larger than 4GB.
More on Remo Zip Repair Tool
- Repairs all types of zipping (32 bit, 64 bit) files & Zipx files
- It can repair files on your system or on any storage media like USB, external hard drive etc.
- A preview option is provided for you to see the files before saving them.
Guide to repair corrupt Zip files
Remo Zip Repair tool makes fixing Zip files easy for you. To start with, download and install Remo Zip Repair software. Run the application and select the corrupt file. The software scans the Zip file and displays a list of files from the archive. Save the required files in the desired location. If the corrupt file had some files in the root, you can find it in ‘Lost files’ folder.