how to refresh icon after change file association in XP?

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VS2008

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Hi all
I tried to change file association of .htm file in XP, and here is how I did it:

1. Change the associated registry key values.

2. Call SHChangeNotify(SHCNE_ASSOCCHANGED, SHCNF_IDLIST, 0, 0) to refresh the icon;

After doing these, I double clicking the .htm file, and it is opened by the browser I expected. But the icon on the desktop is not changed into the new one(e.g. from IE to Chrome). However, if I restart explorer.exe, the icon changed to the correct one.

Can anyone please tell me how to refresh the icon on desktop after changing the file association ?

Any replies from you will be appreciated, thanks.

Posted 27-Feb-12 14:58pm

ericchan1336

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Ganesan Senthilvel · Answer 1 · 2012-02-27T15:06:00

You can use SendMessageTimeout WINAPI function, which receives the message belongs to the same queue as the current thread, the window procedure is called directly—the time-out value is ignored. The below code will help

C#

DWORD result2 = 0; 
LRESULT result = SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, 0,(LPARAM)_T("Environment"), SMTO_ABORTIFHUNG, 5000, &result2);

ericchan1336 · Answer 2 · 2012-10-11T23:14:00

There are two solutions I found from web:
1.change the icon size in the registry then change it back, and sendmessage with
SendMessage(HWND_BROADCAST,WM_WININICHANGE,0,0);
The side effect of solution above is that it will re-arrange the icon layout on the desktop even the auto-arrange is not enabled.

2.SHChangeNotify(SHCNE_ASSOCCHANGED, SHCNF_IDLIST, 0, 0);
This can do the job and have no side effect at all.

how to refresh icon after change file association in XP?

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