SHChangeNotify in Windows 10 not updating Quick Access items
Solution 1:
The Quick Access virtual folder path, as a string, is shell:::{679f85cb-0220-4080-b29b-5540cc05aab6}, (this guid name is CLSID_HomeFolder).
So, you can force a refresh of all items under this virtual folder with a call to:
SHChangeNotify(SHCNE_UPDATEDIR, SHCNF_PATHW, L"shell:::{679f85cb-0220-4080-b29b-5540cc05aab6}", NULL);
If you want to refresh only a specific set of children, just get the PIDL or the path of these items and call SHChangeNotify(SHCNE_UPDATEITEM, ...) on each.