SharePoint Online: Fix "Error 0x800700DF: The file size exceeds the limit allowed and cannot be saved"

Problem: When copying a file from SharePoint Online through file explorer, got this error message
"An unexpected error is keeping you from copying the folder. If you continue to receive this error, you can use the error code to search for help with this problem. Error 0x800700DF: The file size exceeds the limit allowed and cannot be saved."
Error 0x800700DF: The file size exceeds the limit allowed and cannot be saved

Also, when tried opening the file directly, received "Could not open file <File-URL>. Probable cause: File Sharing or file permissions problem".
could not open file probable cause file sharing or file permissions problem
Solution:
I've seen this error in SharePoint On-premises environment when the user tries to upload a file larger than the maximum limit configured in central Administration site (Central Administration >> Application Management >> Select Your Web App >> General Settings >> Maximum upload size). Here is SharePoint Online, the root cause of this issue is the limit set on Web client service that is responsible for opening files through file explorer (or mapped network drive!). By default, Larger files over 100 MB stored in SharePoint can't be directly opened in the Mapped Drive/File Explorer view due to the file size limit of web client service. Here is how to increase the file size download limit in the client machine:
  • Open Windows Registry using "regedit" command as an administrator.
  • Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WebClient\Parameters
  • Right click on the FileSizeLimitInBytes and click Modify
  • Click on Decimal, and type 500000000 and click OK (500 MB!)
  • Go to Services snapin (services.msc) and Restart Web Client service. You may have to restart the machine at times.SharePoint Online Webclient file size limit registry Fix

This will increase the web client file size limit to 500MB, which is a maximum file size you can download using WebDAV.

To avoid this issue, you can open the Zip File using Web Browser instead of Mapped Drive or File Explorer View!

Microsoft KB article addressing this issue: https://support.microsoft.com/en-ae/help/900900/folder-copy-error-message-when-downloading-a-file-that-is-larger-than
SharePoint Online: Fix "Error 0x800700DF: The file size exceeds the limit allowed and cannot be saved" SharePoint Online: Fix "Error 0x800700DF: The file size exceeds the limit allowed and cannot be saved" Reviewed by Salaudeen Rajack on August 20, 2019 Rating: 5

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