Notes about the WEF 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 WEF file type is primarily associated with 'Exchange' by Microsoft Corporation. A workflow process is a series of tasks or events, the order in which they must be performed, and code that runs when they are performed.