/ResetSettings (devenv.exe)
Restores the default settings for Visual Studio and automatically launches its integrated development environment (IDE). Optionally resets the settings to the specified .vssettings file.
Devenv /ResetSettings SettingsFile
Restores the default settings for Visual Studio and automatically launches its integrated development environment (IDE). Optionally resets the settings to the specified .vssettings file.
Devenv /ResetSettings SettingsFile