File name containing character + cannot be downloaded

If the file name contains the character "+", an 404 error will occur when the file is downloaded from the IIS Web server.

Cause & Solution:

In IIS Manager, select the folder which contains the character "+" in the folder or file name, and then double click Request Filtering on the Features View.

Click Edit Feature Settings in the Actions pane.

In the Edit Request Filtering Settings dialog box, select Allow double escaping.