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I've a Logitech Media Keyboard 600 which features a separate button to launch the calculator. I need that quite often, but the Windows shipped calculator is useless; there are more advanced out there.

So I've installed another calculator application and want this special key start this other app instead of the default one.

Is that possible?

I'm not searching for a solution to pin the app to the taskbar and use another shortcut key to launch it.

  • 1
    The new calculator in Win7 is really good. What do you find better? – paradroid Sep 25 '10 at 22:17
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    E.g. PowerToys Calculator for WXP, didn't work for W7 but SpeedCrunch does. Need something with history and such. – mark Sep 25 '10 at 23:56
  • @mark, you may want to consider that Tim C's answer is less invasive than the accepted answer and seems to be the ideal solution. – jnm2 May 14 '15 at 12:36
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Did you try Logitech's SetPoint software? It may not let you change what program the key opens, but it's worth a try. I don't have a Logitech keyboard, so I can't check.

You could also try replacing the Calculator executable (%windir%\system32\calc.exe) with the other calculator, but that may be risky.

  • That's it! I always avoid this vendor supplied software, have had too much bad experience with it the last 15 years .. but seems time changes ;-) With this software you can configure the key to run any app you want. – mark Sep 26 '10 at 0:13
  • Good to hear! I was guessing a little, since the Logitech website doesn't specify which keys are programmable. Some keyboards have programmable keys but don't let you modify media/special function keys. – Velociraptors Sep 26 '10 at 0:36
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Edit this registry key:

HKLM/software/microsoft/windows/currentversion/explorer/appkey/18/ShellExecute

If it does not exist, create a String Value with name ShellExecute and as value the path to your program.

  • 2
    Thanks, that was also helpful and works without the need to install any software! – mark Oct 4 '10 at 12:27
  • Mine is 'HKEY_LOCAL_MACHINE' rather than 'HKLM'. – Dan W May 4 '13 at 15:38
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    'HKLM' is a std. abbr. for 'HKEY_LOCAL_MACHINE' – Mark Cidade Sep 19 '13 at 15:22
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    On Windows 10 HKLM/software/microsoft/windows/currentversion/explorer/appkey/18 is empty. Edit: ShellExecute is a String Value that you have to make, and it's value should be the full path. – Mark Jeronimus Jun 29 '16 at 16:19
  • In my case (Windows 10) the value which was there by default was ShellExecute=calc.exe. Changing this to a full path of the calculator of my choice worked fine. – Suma Sep 7 '17 at 7:47

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