InstallAware

With some worarounds I'm able to add a new value to an existing key within a inifile. If I uninstall the product unfortunatelly not onle the single value will be deleted but the hole key becomes deleted.

How can I influance the uninstall routine?

I the a way to solve the problem except to write a own DLL which is doing the work for me?

I'm not sure what you mean by the workarounds

There are several possible values for editing INI entries:

Line->Create or Update
Line->Create Only
Line->Remove
Tag->Add
Tag->Remove

Which of these did you try?
It seems to me you want the Line->Create or Update option...
The Tag options add values to an already existing value (ex: VALUE=DATA1;DATA2, etc.)

You are right I used the wrong action. I have to use Tag->Add.