some observations:
VS2008 now uses the Common File Dialog. With Powertoys TweakUK, I was able to set all places to "none", and the VS2008 Open File dialog box would become empty.
, VS2008 : "Desktop", "standard_project_folder", "My Computer".
Sysinternals RegMon , [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\comdlg32\PlacesBar] ctrl + o... , , .