Simulate UNIX rename() with Win32 MoveFileEx() for directories

Question

I want to simulate a specific case of the UNIX rename() function to rename directories. Its MAN page specifies:

oldpath can specify a directory. In this case, newpath must either not exist, or it must specify an empty directory.

I want to simulate the last case:

newpath exists and is empty.

So I have created the directories foo_dir and bar_dir and called MoveFileEx() in order to rename foo_dir to bar_dir. Here is the code without error management:

mkdir("foo_dir");
mkdir("bar_dir");
MoveFileEx("foo_dir", "bar_dir", MOVEFILE_REPLACE_EXISTING)

But MoveFileEx() always fails with error 5 (access denied). I have tried with other flags for MoveFileEx() without success.

Must I manually remove bar_dir if it exists and is empty before calling MoveFileEx()? Or is there another solution?

I have not tried ReplaceFile() yet.