What type of value must a rogue key be configured as in order to store user data in the registry?

A rogue key configured as a string value is essential for storing user data in the Windows registry because string values are designed to handle textual information, which is often how user data is represented. String values can store sequences of characters, making them suitable for keeping user-specific data like usernames, file paths, or settings that need to be retrieved as text.

Other types of values, such as binary values, store data in a raw format and are typically used for non-textual data. Multistring values support an array of strings separated by a null character, which is useful for lists but not directly appropriate for single user data entries. DWORD values are numeric and are best suited for storing integers or settings that require numerical representation rather than text. Thus, when aiming to store user data, particularly as text, configuring the rogue key as a string value is the most effective approach.