Error with zip files

Please help us by providing the following info. Before posting please also check the pinned "Known issues" threads and make sure that you're running the latest available version for your oC release:

Steps to reproduce
1. Share a folder using using a link
2. User downloads the folder, which is becomes and zip file
3. When user uses 7zip to extract it, he gets a header error. But all seems ok.
4. Using WinRar no error messages and all fine

Expected behaviour
Extract with no errors using 7zip

Actual behaviour
Extracted with header error using 7zip

Server configuration
Operating system: Ubuntu 16.04
Web server: normal LAMP from Ubuntu installation
Database: normal LAMP from Ubuntu installation
PHP version: normal LAMP from Ubuntu installation
ownCloud version (see ownCloud admin page): ownCloud 9.1.1 (stable)
Updated from an older ownCloud or fresh install: fresh install
Special configuration (external storage, external authentication, reverse proxy, server-side-encryption): no

ownCloud log (data/owncloud.log)

Please paste possible errors in the following code block, see for more info

Integrity status for oC9+

Login as admin user into your ownCloud and access
paste the results here.
"No errors have been found."


please report such issues directly to:

Thanks for posting the issue to the bugtracker, here is the reference:

Problem still exists for me in oc 10.0.8
Share Folder (for example with multiple pdf’s)
-> download it as zip -> extract with 7-zip -> headers error


i’m not sure how much of a help a “me too” in a user support forums is if there was already a bugreport done previously. :confused:

But if i’m clicking on the link posted by @anon30676603 above i can find the following statement:

This is basically a known “issue” - some zip tools don’t support all specifications of of zip.
Not much we can do -> close

If i’m understanding this correctly there won’t be a possible solution.

ZIP folder then share is my solution.

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@tom42 i do not understand completly what you mean with this statement. But my information is that in the
oc 10.0.4 and above the problem should not exists. but for me it does. (not more i would say with my

Can you guys please post the version of 7zip you are using as well as the operating system.

For me on linux the archive shows no errors:

i’m using 7-Zip 18.05 (x64) on Windows 10 64Bit (Clientside)
OC Server = ubuntu 16.04.4 LTS; PHP 7.0.30;
OC Version = 10.0.8

with 7z on OC Server = Ubuntu for me also is ok (but not on Windows 7z Gui)

Can you please post a screenshot of the error message on windows ?

Interesting - so 18.05 has the issue … we should talk to the developers …

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Does anybody in here have an account at sourceforge? Please post an support request in