Excel's Protected View feature opens documents in read-only mode and disables editing functions. There are several reasons why documents are opened in read-only mode. Documents opened from the SmartVault Drive are considered "Files originating from the Internet" and are opened in Protected Mode by default.
This feature, however, slows down the opening of excel documents from the SmartVault Drive. Turning off protected mode for files originating from the Internet will increase the speed of which excel files open from the SmartVault Drive.
Resolving This Error
To disable Protected View in Excel, follow the steps in this section. These steps can be applied for Excel 2010, 2013, and 2016.
1. Click File > Options.
2. Click Trust Center > Trust Center Settings > Protected View.
3. Disable the Enable Protected View for files originating from the internet checkbox.