When you download a .zip file from a SharePoint Services document library, and then try to open the .zip file, sometime you may receive 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.
Such problem occurs when HTTP (Hypertext Transfer Protocol) compression is turned on the SharePoint Virtual Server. When you download the .Zip File, it’s encoded as GZIP. When the error occurs, browser client passes the file directly to UNZIP program, without GZIP decoding the file.
In this case, you first need to determine whether HTTP compression is turned on or not. If the HTTP compression is turned on, then follow the steps:
1. Click on Start, then go to control panel there point to Administrative Tools, and then click 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 Web Sites, and then click Properties.
4. Click the Service tab to view the HTTP compression properties.
Once the HTTP properties are determined, change the MIME (Multipurpose Internet Mail Extensions) type for .ZIP file from application/x-zip compressed to
application/octet- stream. To change the MIME type, follow the steps:
1. Click Start, then go to control panel there point to Administrative Tools, and then click Internet Information Services (IIS) Manager.
2. Right-click the server (local computer) tree, where server (local computer) is the name of your IIS server, and then clicks Properties.
3. Click MIME Types.
4. Scroll down the registered MIME type list to find the .zip entry.
5. Click the .zip application/x-zip-compressed entry, and then click Edit.
6. Change the MIME type value to application/octet-stream.7.Stop and then restart the IIS Admin Service to apply the change to the MIME type.
Once you have downloaded the file, check, whether there are any corrupted files in the Zip archive. The only reason for the corruption of zip files in this case could be virus attack. In this case; you need to take the help of third party zip recovery software.
Zip Recovery Software helps in recovering the corrupted files which have been corrupted due to virus attack or sabotage. A Zip repair Software helps in repairing and restoring the corrupted .zip files and zip archives. It scans all the selected Zip files and utilizes an advanced algorithm to restore damaged Zip files to their original location. It is designed to repair and recover large Zip files up to 800 MB. These software come with graphical user-friendly interface and simple to use.
Cannot open file: it does not appear to be a valid archive. If you downloaded this file, try downloading the file again.
Such problem occurs when HTTP (Hypertext Transfer Protocol) compression is turned on the SharePoint Virtual Server. When you download the .Zip File, it’s encoded as GZIP. When the error occurs, browser client passes the file directly to UNZIP program, without GZIP decoding the file.
In this case, you first need to determine whether HTTP compression is turned on or not. If the HTTP compression is turned on, then follow the steps:
1. Click on Start, then go to control panel there point to Administrative Tools, and then click 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 Web Sites, and then click Properties.
4. Click the Service tab to view the HTTP compression properties.
Once the HTTP properties are determined, change the MIME (Multipurpose Internet Mail Extensions) type for .ZIP file from application/x-zip compressed to
application/octet- stream. To change the MIME type, follow the steps:
1. Click Start, then go to control panel there point to Administrative Tools, and then click Internet Information Services (IIS) Manager.
2. Right-click the server (local computer) tree, where server (local computer) is the name of your IIS server, and then clicks Properties.
3. Click MIME Types.
4. Scroll down the registered MIME type list to find the .zip entry.
5. Click the .zip application/x-zip-compressed entry, and then click Edit.
6. Change the MIME type value to application/octet-stream.7.Stop and then restart the IIS Admin Service to apply the change to the MIME type.
Once you have downloaded the file, check, whether there are any corrupted files in the Zip archive. The only reason for the corruption of zip files in this case could be virus attack. In this case; you need to take the help of third party zip recovery software.
Zip Recovery Software helps in recovering the corrupted files which have been corrupted due to virus attack or sabotage. A Zip repair Software helps in repairing and restoring the corrupted .zip files and zip archives. It scans all the selected Zip files and utilizes an advanced algorithm to restore damaged Zip files to their original location. It is designed to repair and recover large Zip files up to 800 MB. These software come with graphical user-friendly interface and simple to use.
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