Limits to open SharePoint 2010 libraries in Windows Explorer

Posted on 2015-02-05
Medium Priority
Last Modified: 2015-02-14
Does anyone know if there are limitation on the number of items in a SharePoint 2010 document library that would prevent it from opening in Windows Explorer?
I can open a library with 33K+ documents but am having a problem with a library where there are 100K+ files.
No errors in the Events or System logs.
Should I follow this article

The problem occurs because the size of all the file attributes that are returned by the WebDAV server is much larger than what is expected. By default, this size is limited to 1 MB.

To work around this problem, you need to modify the windows registry on the client computer.

 Data Type: DWORD
 Default Value: 1,000,000
 decimal (1 MB)

Change the default value to a larger number, e.g. 100000000 for 100mb.

Question by:IT-NYC
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Accepted Solution

Rainer Jeschor earned 2000 total points
ID: 40592297
as the explorer view uses the WebDAV feature and the webclient service on the client side, there are some default settings in Windows 7 like default timeout and maximum upload size mentioned in this MS KB entry:

Besides that the general considerations for large lists and libraries will take account in regards to performance.

Author Comment

ID: 40594762
Thanks, Rainer!
I will try and let you know.
Have you tried opening libraries with the number of files I mention?
LVL 44

Expert Comment

by:Rainer Jeschor
ID: 40594871
nope - I always tried to keep the libraries / folders on a reasonable size (max 5000 elements on one level).
Too many bad experiences from colleagues and customers who did not follow this approach :-)
But there are also other factors to consider e.g. item level permissions - this can kill performance as well (my first experience on SP 2010 saying you can have thousands of documents and you can have item level permissions - but it seems that nobody really tested the combination of both :-D)
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Author Comment

ID: 40594909
I hear you loud and clear, been there.
In my case, it is a combination of large number of folders and files. Will see it on Monday. I am optimistic :)
LVL 44

Expert Comment

by:Rainer Jeschor
ID: 40594920
Good luck - and have a nice weekend

Author Comment

ID: 40594932
You, too.

Assisted Solution

IT-NYC earned 0 total points
ID: 40599313
It worked!!!
Thanks a lot
I applied the registry setting: FileAttributesLimitInBytes to 100000000
and FileSizeLimitInBytes 200000000
in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WebClient\Parameters
FsCtlRequestTimeoutInSec to 3600 in HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MRxDAV\Parameters
In IE, modified Compatibility settings as it wasn't opening from the menu (you have to add this site to the Trusted Sites message).

Author Closing Comment

ID: 40609526
Part of the solution was my own findings.

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