When opening the file, a message box informed me that
The Test Run Configuration file "<path>\localtestrun.testrunconfig" does not have the expected format:
Failed to instantiate type 'Microsoft.VisualStudio.QualityTools.WebStress.WebTestRunConfig, Microsoft.VisualStudio.QualityTools.LoadTest, Version=18.104.22.168, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a': Could not load file or assembly 'Microsoft.VisualStudio.QualityTools.LoadTest' or one of its dependencies. The system cannot find the file specified.
From here, I found out that the file needs to be opened as XML, any elements containing "WebTest", "WebStress" or "LoadTest" need to be deleted from the XML file (along with their children, grandchildren and pets).
[Tags: visualstudio unittest teamsystem]