Tuesday, June 2, 2009

‘WinZip Self-Extractor file is damaged..’ error opening a .ZIP file

The Zip format allows you to compress large files by using compression algorithms. These files are generally used over networks and secondary storage media like flash drives. Zip files get corrupted due to CRC (Cyclic Redundancy Check) errors, faulty network hardware, improper system shutdown, virus etc. Corruption of .zip file results in inaccessibility of the data. In such situations, you need to restore the data from latest backup. However, if there is no backup available then you need to repair the .zip file by using powerful Zip Repair tools.

Consider a scenario, when you try to open a zip file that you downloaded from an FTP site, you encounter the below error message:

"WinZip Self-Extractor Zip file is damaged, truncated, or has been changed since it was created. If you downloaded this file, try downloading again."

The above error message is encountered due to .zip file corruption and the data stored in file becomes inaccessible and you encounter the same error message when you try to open the .zip file.

Cause:

The above error message mainly occurs if WinZip self extractor when there is mismatch between the file checksums. Another major cause for the above error message is file system corruption.

Resolution:

The best possible ways to resolve the above error message are discussed below:

• You need to run the windows disk scan utility (CHKDSK). This utility enables you to check and repair the corrupted files.

• You can delete the previously saved .zip file and download it again from the FTP site.

• You need to make sure that your internet connection is stable.

However, if the above ways fails and you still encounter the same error message, then you need to use powerful and updated Zip Repair software. Such Zip Recovery tools use high end scanning algorithms that provide effective repair of corrupt .zip archives. These software come with graphical user-friendly interface and simple to use.

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