Which directory is this file located in?
Reason I ask is, I want to back up my settings.
In Visual Studio, go to Tools -> Options -> Environment -> Import and Export Settings. Your settings file is saved to the directory specified by the Automatically save my settings to this file box.
It was %userprofile%\Documents\Visual Studio 2008\Settings\CurrentSettings.vssettings on my machine.
See How to: Share Settings Between Computers. And yes, it's a misleadingly-named option heading.