How to fix ICE57.Per-User installation

Question

Our application writes some settings to the registry into the HKCU hive during runtime. I want to delete this settings during uninstall. Here is code:

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Answer 1

You are operating on the HKCU hive which is only available to the current user.

MSDN states:

ICE57 validates that individual components do not mix per-machine and per-user data. This ICE custom action checks registry entries, files, directory key paths, and non-advertised shortcuts. Mixing per-user and per-machine data in the same component could result in only partial installation of the component for some users in a multi-user environment.

The ICEs are validations on your installation package. As stated above, ICE57 is to make sure you don't mix up per-machine and per-user constructs. If you must remove entries to HKCU during uninstall (and the software is installed per-machine) then you can turn off that specific validation in Visual Studio in Properties > Tool Settings as shown in the screenshot below:

However, you may want to think about the root cause of your issue. If you are doing a per-machine install, your installer or application should probably not be writing to HKCU as it is only available to the current user, whereas your app is installed for all users.