Notes about the SPDESIGNNAV file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries
, unused processes and other unfavourable system settings to identify slowdown issues.
The SPDESIGNNAV file type is primarily associated with 'SharePoint Designer' by Microsoft Corporation. Office SharePoint Designer provides tools to automate business processes, build efficient applications on top of the Microsoft SharePoint platform, and tailor SharePoint sites.