How to remove a single registry VALUE at uninstall of an MSI?

There is a particular registry value that my application sometimes creates during execution, i.e. N开发者_Python百科OT at installation. This value is within a registry key that I don't want to delete; I just want to delete the value that I created. Because it's not created at install it's not automatically deleted at uninstall by windows installer. What can I do in the MSI to delete this value if it exists?

The Registry table doesn't seem to have this option. Does that mean I have to write a custom action? If so, anyone have any examples?

I'm using Wise Windows Installer Edition to create the MSI.

Also posted here.

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Sorry, you will need a custom action.

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You do need to do a custom action.

I ended up implementing this with a custom action placed after the WriteRegistryValues within Deferred section.

The .vbs to delete the key is like this:

const HKLM = &H80000002
strComputer = "."
Set oReg=GetObject("winmgmts:{impersonationLevel=impersonate}!\\" & strComputer & "\root\default:StdRegProv")
strKeyPath = "SOFTWARE\Mozilla\Firefox\Extensions"
strValueName = "myext@myco.com"
oReg.DeleteValue HKLM,strKeyPath,strValueName