问题 I'm trying to retrieve the complete list of the user's preferred languages from a C++/Qt application, as configured in the "Region & language" page in the user's preferences: For that, I am trying with the WinAPI function GetUserPreferredUILanguages(), on an up-to-date Windows 10 Pro system. However, the function always only returns the first entry (the main Windows display language), and "en-US". If English is configured as the main language, then only "en-US" is returned. E.g., if I have