Problems with ZIP compression in IIS

When you download a .ZIP file from a Microsoft Windows SharePoint Services Document library, and try to open that file, you may encounter the following error message:

Cannot open file: it does not appear to be a valid archive. If you downloaded this file, try downloading the file again.

You may face this problem if HTTP compression has been turned on in the Web Sites properties of Microsoft Internet Information Services (IIS) on the SharePoint virtual server. When you download a .ZIP file, IIS may encode the file as GZIP (GNU Zip).

The browser client passes the file directly to the unzip program, with GZIP not decoding the file. You need to check if HTTP compression has been turned on. To check this:

1. Click on Start, press Administrative Tools, and then click on Internet Information Services (IIS) Manager.
2. Expand the server (local computer) tree, where server (local computer) is the name of your IIS server.
3. Right-click on Web Sites, and then click Properties.
4. Click the Service tab to view the HTTP compression properties.
   

To solve this problem, you need to modify MIME (Multipurpose Internet Mail Extensions) type for the .ZIP file from application/x-zip-compressed to the application/oclet-stream. To modify MIME type, please follow these steps:

1. Click on Start, point to Administrative Tools, and then click on Internet Information Services (IIS) Manager.
2. Right-click on the server (local computer) tree, where server (local computer) is the name of your IIS server, and then click on Properties.
3. Click on MIME Types.
4. Scroll down to the registered MIME type list to find the .zip entry.
5. Click on the .zip application/x-zip-compressed entry, and then click Edit.
6. Modify the MIME type value to application/octet-stream.
7. Then Stop and then restart the IIS Admin Service to apply the change to the MIME type.
   

You will be able to overcome this problem after following these steps. If you still face this problem the .ZIP files may have been corrupted or damaged. You will not be able to open or access them and will need ZIP recovery software.

The software will help you to repair and recover corrupted .ZIP files. It will also help you to repair corrupted .ZIP files in case of a virus attack, unexpected system shutdown or a media read error. ZIP Repair software scans the damaged files and restores damaged .ZIP files to their original state. It can help you in all the above mentioned scenarios to recover your corrupted .ZIP files.

Zip Files Downloaded with Internet Explorer Are Not Saved to Your Computer

When you download a Zip file using Internet Explorer, you may experience any of these problems:
It appears that the file has been downloaded, but when you try to open it with Zip it displays a blank window.
If you try to search for the file, you will not be able to locate it. It will show that the file does not exist on your hard drive.
In case you are using Windows XP, and using Zip file format for file compression, you will encounter the following error message:

The Compressed (zipped) Folder is invalid or corrupted.
To overcome these problems, you need to follow this procedure:
Before starting the download process, you need to make sure that the
Confirm open after download option is selected.
To confirm this:
Click on the Start menu, press Settings and click Control Panel.
Double- click on the Folder Options.
Then Click on the File Types tab.
Scroll down to and click the .zip extension.
Click on Advanced.

You need to verify that Confirm open after download option is selected.You will be able to solve this problem by following this procedure.

There are also times when even after a Zip file has been downloaded it will fail to open. You will need to utilize Zip recovery software if you face this problem. Other instances can be a virus attack, unexpected system shutdown and media read error. If you experience these problems, you will not be able to open and access your Zip files. You will need to use Zip recovery software in these scenarios.

The software is a powerful tool to repair and recover your corrupted or damaged Zip files. It utilizes an innovative feature and performs a complete scan of all the selected Zip files. The software uses powerful algorithms to restore the damaged Zip files to their original state. You can also repair and recover large Zip files up to 800 MB by using this zip repair utility. Additionally, the software helps in saving and restoring files to their original location on the hard disk, or on any other user specified storage media.

Repairing a Zip File

The Zip file format is one of the most widely used data compression and archival format. In a Zip file, one or more files are compressed to reduce the file size or they can also be stored in their original form. ZIP files normally use the file extensions ".zip" or ".ZIP" and the MIME (Multipurpose Internet Mail Extensions) media type application/zip. The files can be sent much more quickly through the internet using Zip file format. The Zip format offers very simple archiving which allows each file to be compressed separately. It is a very convenient file format but also prone to various errors. The possible reasons for that could be software malfunction, virus attack or unexpected system shutdown. You will receive the following error messages:

• CRC (cyclic redundancy check) errors in downloaded zip.
• Cannot open file: not a valid archive.
• An error occurred while copying the zip file to the course directory.
• Cannot open file: it does not appear to be a valid archive.
• The Compressed (zipped) Folder is invalid or corrupted.
• The archive is corrupt.
  
• File Path: Either multipart or corrupt ZIP archive.

If you encounter any of these error messages, you will not be able to access or save your zip files. You will need the help of Zip repair software to repair the damaged zip files.

The software helps in the repair and recovery of corrupted Zip files. It scans all the selected Zip files and utilizes an advanced algorithm to restore damaged Zip files to their original location. The software also provides repair and recovery for corrupted Zip archives. It is designed to help in repair and recovery of large Zip files up to 800 MB.

Additionally, the software helps in saving and restoring files to their original location on the hard disk, or on any other user specified media. Zip Recovery is an efficient repair and recovery tool to alleviate your Zip file related problems.

Repair corrupted Zip Files

It is very essential to realize the importance of data and store it in an organized manner. It helps us in managing and accessing data quickly and without any problem. Most of the data is stored in the form of files and various file formats are used to store data.

The Zip file format is one of the most popular data compression and archival format used to store data. A Zip file typically contains one or more files which have been compressed to reduce the file size or stored in their original form. It comes in various versions such as WinZip, BOM Archive Helper, Info-ZIP, WinRAR, Universal Extractor and Zip Genius.

ZIP files normally use the file extensions ".zip" or ".ZIP" and the MIME media type application/zip. There are some software which use Zip file format to compress a large number of files. The advantage of using Zip format is that it is a very simple archive format which compresses each file separately. It allows individual files to be retrieved easily without reading through other data which means that it allows better compression by using different algorithms for different files.

Even though Zip file format is very convenient and widely used format users may experience some problems when they try to access and save zip files on their computers. Some of the most commonly faced error messages are the following:

• Database and data store files were not successfully extracted from zip file.
• An error occurred while copying the zip file to the course directory.
• Cannot open file: it does not appear to be a valid archive
• The Compressed (zipped) Folder is invalid or corrupted.
• The archive is corrupt.
• File Path: Either multipart or corrupt ZIP archive.
• File Path: Wrong Password for "File Path".

These are some of the most common error messages faced by users of Zip. You will not be able to access your Zip files in these cases. You will need the help of Zip repair software in these situations.

The software will help you recover corrupted Zip files after repairing the damage in the zip files. The software scans corruption in zip files and repairs it to recover data. It also helps in repairing and recovering all Zip files and archives. The software also supports Zip recovery in the case of a virus attack, unexpected system shutdown or a media read error. It can also repair and recover large zip files up to 800 MB. Additionally, the software helps in saving and restoring files to their original location on the hard disk, or on any other storage media.