Uninstall without an MSI file

I often get a problem with Windows Installer trying to uninstall a package, but it complains that:

The feature you are trying to use is on a network resource that is unavailable.

Is there a known means of uninstalling such packages when the original MSI is simply not available?

Do I need MSI files?

msi) and setup patches (. msp) used for your currently installed programs. These files are required if you want to update, modify, or uninstall a program on your computer. Do not delete them blindly.

How do I uninstall another MSI package when my application is uninstalled?

set the "Working directory" field to SystemFolder. set the "File path" field to msiexec.exe. set the "Command line" field to /x GUID /qb, where GUID is the Product Code of the package you want to uninstall.

Please note that Microsoft has now released an official tool to resolve these issues, without the problems that previously existed with MSIZAP.