With recent Microsoft Office updates, you may get the following message.
Depending on your system and network security settings, you may be able to just right-click, select Properties and “Unblock” the file.
To Unblock one file with PowerShell if the “Unblock” option is not available under Properties
unblock-file -path "full path of blocked file"
To Unblock all files in a folder using PowerShell
get-childitem "full path of folder" | unblock-file