Wise Installation Studio can be used to create uninstalls which clear all application related contents along with the files created during application runtime.

I don't understand:
"It would be great if the uninstallation process invokes an assembly which contains a method to override Uninstall class."

Can we invoke an assembly during uninstallation which has a method to override Uninstall class. Is there any custom action to do the same.

There is no pre-existing custom action to invoke an assembly during uninstall.

However, if you can perform this process from a command line, then you should be able to write a custom action to do exactly the same job.

Then all you need to do, is to add a condition on the custom action of:  REMOVE="ALL"
and this will ensure that the custom action runs only on uninstall. Ensure that the condition is written entirely in upper case.

EdT,

Thanks for your comments.

Is REMOVE="ALL" the point of invocation, to call an assembly during uninstallation. And should we script this in "Execute Immediate". Please help me on this. Thanks.

Yes, use that condition when you want something to be executed during removal, what this means is that the condition will resolve to true if all features are to be removed during uninstall.

Any custom action making changes to the system should be executed in deferred sequence under the System context.