How to retrieve a task from MWS into Designer?

We lost the only copy of a process. We were able to pull out the .process from the production database.

We are able to locate an associate task in MWS but I have no clue on how to pull this back in Designer as the only files on the MWS are the built .Class.

Is there any way to reconstruct the task project from the MWS??

Many thanks in advance