In Windows XP and later, the Windows file redirector has a built-in WebDAV client which can be used to mount a Windows drive letter to a WebDAV Server, such as what is provided with our on-line Mobile Office service. When you copy files to this drive mapping, they are stored on the WebDAV server, which can be accessed from any computer via a drive mapping or via our Mobile Office web interface. When trying to copy large files you might run into a error that says “Error 0x800700DF: The file size exceeds the limit allowed and cannot be saved”. Windows has a built in limit on the size of a file that is allowed to be copied using WebDAV. To change this limit you must edit a registry subkey which holds the value limit, and reboot your computer. To change this registry setting do the following:

1) Click Start, click Run, type regedit in the Open box, and then click “Ok”.
2) Locate “HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\WebClient\Parameters” from the drop-down structure in left pane.
3) Right click on the “FileSizeLimitInBytes” subkey listed in the right pane, then click “Modify”.
4) Click the “Decimal” bubble under the “Base” section.
4) In the “Value data” box, type 4294967295, and then click “Ok”.
6) Reboot your computer.

Completing the above increases the WebDAV file limit in Windows you can copy via WebDAV to 4 gig for a single file.

Please note: Unfortunately, the built-in WebDAV client (WebClient service) in Windows 10 was officially deprecated as of November 2023 (https://learn.microsoft.com/en-us/windows/whats-new/deprecated-features). While it has not been completely removed yet, it is no longer under active development and is not started by default. You will have to start the “WebClient” service manually in any versions of Windows past November 2023 to get WebDAV to work. Microsoft has marked it for removal in a future version of Windows.

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