Delphi TOpenDialog/TSaveDialog last used path - windows

Question

Referring my question to this answer: https://stackoverflow.com/a/4016075/698266, in particular step 3 says "Otherwise, if the application has used an Open or Save As dialog box in the past, the path most recently used is selected as the initial directory."
Where does Windows save this information?
Note: by experimenting, it seems to be linked to the application file name without its path - i.e. the same executable copied in different directories "sees" the same last path information, while changing the exe file name makes the dialogs point to the user's Documents directory.
My actual interest is for testing purposes. I need to "reset" this information in order to test my application in conditions similar to a first run.

Answer 1

Windows XP uses HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\ComDlg32\LastVisitedMRU and the format of each item seems to be ExeFilename+Path with both strings zero terminated and in UTF-16LE format. The MRU list is stored as a string named MRUList.
Newer versions of Windows uses HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\ComDlg32\LastVisitedPidlMRU and HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\ComDlg32\LastVisitedPidlMRULegacy and the format seems to be ExeFilename+ItemIdList (ExeFilename in UTF-16LE and zero terminated). The MRU list seems to be a list of DWORDs in a binary value named MRUListEx and the list is terminated by 0xffffffff.
I would assume that the change happened in Vista because that is when the new IFileDialog was added. LastVisitedPidlMRULegacy is probably used when GetOpen/SaveFileName is called with a custom template and/or hook function.

Answer 2

I finally found the answer myself.
For Windows 10 (this may be different in different versions of Windows, as David pointed up) there's a list of values in the registry that keep track of the executable name and its associated last "visited" path.
The list can be found in this key:
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\ComDlg32\LastVisitedPidlMRU
In order to reset the default open/save path for a particular program, you have to find the value whose data string (UNICODE) starts with your executable name and delete it. If you watch at the data string, you'll notice that the last used path is there, after the executable name.