|FileOpenPatcher will do what you want - this silly Windows "feature" has bugged me for years, so your plea spurred me to renewed action to find a fix. The box is the "Common Dialog Box", and its size & view are set by COMDLG32.DLL and not by registry entries.|
I must just have chosen the right "Google-speak" this time, as I found the pot of gold, or as the author of the fix calls his website, "A jewel in the internet".
Some other goodies on that page you might be interested in too. Why can't MS get guys like this to work for them?