- Disable Capturing mode from the bottom left corner
- Remove all requests from Fiddler; this step is optional and if it ware skipped fiddler will append requests from loaded archive to the current list of requests
- Chose File > Load Archive from the main menu
- Open Fiddler archive file (.*saz)
For the full guide to developing VSTS WebTests please refer to the Using Fiddler with VSTS.