Cause:  Windows 64-bit Operating Systems do not have the functionality built in to open WebDAV files folder technology.

Blackbaud is unable to address this issue because it is related to third-party software. For assistance, contact the third-party vendor.
Note: We provide links to third-party websites in an effort to help you resolve your issue. We are not responsible for the information on third-party websites, and we cannot assist with implementing resolutions from these websites.
1. Update the Web Folders from Microsoft
2. Reboot the computer
3. Set up the Network Place again and attempt to connect.

NOTE: For additional Web Folder troubleshooting steps see Microsoft KB: 287402

OR

Alternative Solution:  Configure BitKinex 3.2.3 for Windows to access the Files Folder.
Alternative Solution:  Use direct download Disk Mapping to save the file directly to the local computer.