Why latest emacs version don't support Windows 7 taskbar?

I think I've found a way though I have no idea why it works...

Instead of dragging the emacs icon from the folder to the taskbar (which will duplicate icons), open 'runemacs.exe' with no pre-existing icon in the taskbar. Now right click on the icon already running in the taskbar, and pin that to the taskbar. For some reason on my PC, that stopped the duplicating of icons. Now do the shift right-click thing and change the target from emacs.exe to runemacs.exe. Now (for me at least) the Emacs icon works as expected.

If this does not work, try upgrading Emacs. For example, this did not work for 22.3 but does for 24.3.

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Step-by-step instruction:

1. Run runemacs.exe with no pre-existing icon in the taskbar.
2. Right click on the running Emacs icon in the taskbar, and click on "pin this program to taskbar."
3. Close Emacs
4. Shift right-click on the pinned Emacs icon on the taskbar, click on Properties, and change the target from emacs.exe to runemacs.exe.

The Emacs bug#8268 discussion suggests :

Once you've pinned emacs.exe, edit the properties (you can use shift-right-click) and change the executable path to point to C:/this/is/your/path/to/runemacs.exe instead of C:/this/is/your/path/to/emacs.exe

EmacsWiki explains these problems :

When you start a program using a shortcut pinned to the taskbar, the shortcut is displayed differently while the program is running, but no new taskbar button is displayed. If you start a program that is not pinned to the taskbar, a new taskbar button is created. This is different than previous versions of Windows that always created a taskbar button for each window open.

This doesn’t work with emacs, however. To eliminate the console window, it must be started with runemacs. This means we’d have to pin runemacs.exe to the taskbar to start emacs. When it is run, however, it simply starts emacs.exe and exits. Windows will recognize that these are two different programs and will not highlight the pinned icon and will create a new button for emacs.exe.

A workaround is proposed here :

My workaround is to pin emacs.exe to the taskbar and runemacs.exe to the start menu. When I want to start Emacs I have to use the shortcut in my start menu, but once it is running I can just use its taskbar icon as normal. This works reasonably well for me because I typically start Emacs once per desktop session and then just leave it running...