Deinstalling application data. Which path to use in uninstaller?

I am creating an installer using nsis. The application downloads a huge amount of user data. What is the best 开发者_如何学Cway to remove this data in uninstaller?

1. Set the application data path in installer (using environment/registry, config file etc) and use it in application?
2. Use fixed path in both installer and application.
3. Something else ...?

How do you solve this?

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I use the application data path from Windows ("$APPDATA\Application Name") for the data when installing/uninstalling, then delete the directory when uninstalling.