Copying large files between document libraries

Using WebDAV (Explorer mode) seems to be very handy to quickly copy files between document libraries. It works especially well if our farms are on different versions of SharePoint, files don’t  have metadata and don’t need version support. Open 2 windows in Explorer mode for source and destination, drag and drop files between  them and you are done.

One problem exists though. The file size. If it exceeds 50Mb — you’ll get an error:

Error 0x800700DF: The file size exceeds the limit allowed and cannot be saved.

The max upload file size set in CA in the web application settings does not help. This is a client setting in the registry of the computer you are doing file copy operation.

Here is the solution form MS:

1. Click Start, click Run, type regedit, and then click OK.
2. Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WebClient\Parameters
3. In the right pane, right-click the FileSizeLimitInBytes value, and then click Modify.
4. If you cannot see the FileSizeLimitInBytes value, right-click the blank space in the right pane, click New, click DWORD Value, type FileSizeLimitInBytes, and then click OK.
5. In the Edit DWORD Value box, click to select the Decimal option. In the box under Value data, type a value that is larger than the size of the file that you want to download. Click OK.

Note The default value for the file size limit is 50000000 bytes.
Quit Registry Editor. Restart the computer.

https://support.microsoft.com/kb/900900/en-us?wa=wsignin1.0