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Problem with downloaded a zip file from WSS

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Problem with downloaded a zip file from WSS

Postby guest » Wed May 07, 2008 3:51 pm

Q: We are running WSS v3. When a user downloads a zip file from a Windows SharePoint site, the zip file cannot be extracted properly.

A: FYI, the upload file limitation is 50M by default.
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Postby guest » Wed May 07, 2008 3:52 pm

I found that this is a known porblem with IIS. The
defaulte MINE action on ZIP files is "application/x-compressed" The article I
found said to change it to "application/octet-stream". After I made the
change everything started working fine.
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Postby guest » Wed May 07, 2008 3:52 pm

this has been confirmed as a problem in the following
Microsoft products:

o Microsoft Windows SharePoint Services 3.0
o Microsoft Windows SharePoint Services 2.0
o Microsoft Office SharePoint Server 2007
o Microsoft Office SharePoint Portal Server 2003

This problem may occur if HTTP compression is 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 encodes the
file as GZIP. However, the browser client passes the file directly to the
unZIP program, without GZIP decoding the file.

To determine if HTTP compression is turned on, follow these steps:

1. Click Start, 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.

To work around this problem, as you have found, change the MIME type for
the .ZIP file from application/x-zip-compressed to
application/octet-stream.

Microsoft has documented the issue into an article that I would list it
below:

Error message after you download a .ZIP file from a document library in
Windows SharePoint Services: "Cannot open file"
http://support.microsoft.com/?id=841120
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