When you try to extract a Zip file that is downloaded from the MS Windows SharePoint Service Library, you might receive the following error message:
“Cannot open file: it does not appear to be a valid archive. Try downloading the file again.”
You might face this problem if the HTTP (Hyper Text Transfer Protocol), compression has been enabled in Web Site’s properties of Microsoft IIS (Internet Information Service) on SharePoint Virtual Server.
Cause
When a Zip file is downloaded using IIS, IIS may encode that file as GZip (GNU Zip). Thus, the browser clients pass that file directly to unzip program. But the program can't read the file and thus shows the error message.
You may also face this problem due to Zip file corruption. The corruption can take place because of incompatible compression standard. The unzip program can
not read the file in this case and thus show the error message.
Resolution
To fix this issue, you need to alter the MIME (Multipurpose Internet Mail Extensions) type of your Zip file from ‘Application/x-zip-compressed’ to
‘Application/oclet-stream’. MIME type can be changed from the IIS Manager.
If changing the type of MIME does not help, then the problem is due to Zip file corruption and you need to use zip recovery software to resolve it. For easy and automated Zip Recovery, you should go for third party utilities, known as zip repair software. These software ensures complete and safe Zip Repair in most of the corruption scenarios. Zip Recovery tool can repair zip file up to the size of 800 MB.
“Cannot open file: it does not appear to be a valid archive. Try downloading the file again.”
You might face this problem if the HTTP (Hyper Text Transfer Protocol), compression has been enabled in Web Site’s properties of Microsoft IIS (Internet Information Service) on SharePoint Virtual Server.
Cause
When a Zip file is downloaded using IIS, IIS may encode that file as GZip (GNU Zip). Thus, the browser clients pass that file directly to unzip program. But the program can't read the file and thus shows the error message.
You may also face this problem due to Zip file corruption. The corruption can take place because of incompatible compression standard. The unzip program can
not read the file in this case and thus show the error message.
Resolution
To fix this issue, you need to alter the MIME (Multipurpose Internet Mail Extensions) type of your Zip file from ‘Application/x-zip-compressed’ to
‘Application/oclet-stream’. MIME type can be changed from the IIS Manager.
If changing the type of MIME does not help, then the problem is due to Zip file corruption and you need to use zip recovery software to resolve it. For easy and automated Zip Recovery, you should go for third party utilities, known as zip repair software. These software ensures complete and safe Zip Repair in most of the corruption scenarios. Zip Recovery tool can repair zip file up to the size of 800 MB.
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