TipHKCU\Software\Microsoft\Windows\CurrentVersion\Policies\
The Comdlg32 subkey contains entries that store Group Policy settings for the common Open dialog box. The entries in this subkey are written and maintained by Group Policy and read and interpreted by the Open dialog box program.
The entries in the Comdlg32 subkey only affect programs that use the standard Open dialog box provided to developers of Windows programs.
Tip
To see an example of the standard Open dialog box, run Notepad and, from the File menu, click Open.
For detailed information about particular Group Policy settings, see the Group Policy Reference (Gp.chm) on the Windows 2000 Resource Kit companion CD.
For general information about Group Policy, see Group Policy in Windows 2000 Help.
To see a table associating policies with their corresponding registry entries, see the Group Policy Reference Table.