Refresh setting .url indirect by .lnk file

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C

Windows

I am asked to fix a problem. Given is a program written in C / C++, running as a windows-service under LocalSystem user.

On the desktop is a file First.lnk, stored in C:\Users\Public\Desktop. The link points to D:\Second.url.

When the user logs in the contents of Second.url is:

[InternetShortcut]
URL=

During running the service, the program adds a valid url in the second line.

Then I tried using method SHChangeNotify() with different arguments. But nevertheless, a doubleclick on the First.lnk still shows:

The target "" of this Intenet Shortcut is not valid. Go to the Internet Shortcut property sheet and make sure the target is correct.

What do I have to do, that the link on the desktop recognizes, that to targeted .url-file is updates?

Like said above, after a logout / login everything works fine. But that is no solution.

What I have tried:

I have tried

SHChangeNotify()

both on the First.lnk and Second.url. No way.

As arguments I tried: SHCNE_UPDATEITEM, SHCNE_ATTRIBUTES, SHCNE_UPDATEDIR. As 2nd parameter I used

SHCNF_PATHW

or

SHCNF_PATHW | SHCNF_FLUSH

or

SHCNF_PATHW | SHCNF_FLUSH | SHCNF_NOTIFYRECURSIVE