windows 7 - Where are the MRU for Applications in Start Menu stored?

For example, if I have Excel installed and it appears in the start menu, when I hover my mouse on it the most recently used documents are displayed on the right.

They also appear when I right click the icon of an open application in the taskbar.

Where is this list of documents stored for all the applications? How can I clear it for a particular application?

Answer

Answer in this thread, I don't understand the second step "PInvoke", maybe someone could explain.

https://stackoverflow.com/questions/4678445/clean-windows-7-start-menu-mru-list

Now this is the solution for my question:

I Cleaned the values under the Registry Keys HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\UserAssist{CEBFF5CD-ACE2-4F4F-9178-9926F41749EA}\Count and HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\UserAssist{F4E57C4B-2036-45F0-A9AB-443BCFE33D9F}\Count

Then I executed the following PInvoke to refresh the cache of the Explorer.exe:

C#:

using System.Runtime.InteropServices;
[DllImport("shell32.dll")]
static extern void SHChangeNotify(int wEventId, int uFlags, IntPtr dwItem1, IntPtr wItem2);
private const int SHCNE_ASSOCCHANGED = 0x08000000;
private const int SHCNF_IDLIST = 0x0000;
private void ClearCache() {
    SHChangeNotify(SHCNE_ASSOCCHANGED, SHCNF_IDLIST, IntPtr.Zero, IntPtr.Zero);
}