What is the preferred way to store user-level information for .NET application. I could have used registry or config files - but some users don't have enough permissions to save/load from these.
I have heard something about assembly private storage or smth like that, is it a way to go?
My main concern is to make sure that even users with a minimal set of priviliges could be able to access this storage location.
How about User-scoped Application Settings? (They're stored locally in each user's Local Settings folder.) You can create the settings file using the VS designer as well, and they're pretty easy to maintain.
There's more information from MSDN here about the Application Settings architecture in general, with quite a few more links on that page.
Most applications nowadays use some sort of database to store information. SQL Express and SQLLite can server this purpose.