Currently GetFileType() ends up returning the file type solely based on Unix fd type if it gets it from server. The problematic case is when our process gets a pipe or socket fd as a stdin or stderr from Unix. The server object which gets created through wine_server_fd_to_handle is a regular file regardless of the underlying Unix fd type. It probably can't be anything else, at least for pipes, as the pipe should have both ends but we have only one in this case.
That causes problems, e. g., with libuv (used, e. g., by Vampire Survivors). It checks stdout handle type and if it is pipe it tries to do SetNamedPipeHandleState() on it and does not tolerate the failure.
It looks more sensible to me to report all the pipes and sockets created through wine_server_fd_to_handle() as regular files as that matches the server objects we have for them. When that is not the case we should get the correct type from server fd type.