In the original post I mention that passing the value of the string throught the arguments or other means similar, that do not envolve a direct setting of the string, will work. Your code...

perl6 -e '$_ = "/bäçelor"; mkdir $_ or die $!; say .IO.d && .IO.e'
[download]

...will work with me also.

The problem is within the direct setting of the string variable and then doing a -d testing. I know that it is hard to get it, but that is what I'm dealing with, not just in one computer or one version of perl, but diferent computers, and diferent perl versions, all in the Windows context.

Again, I am sure that there is a solution for the problem, but it will require lines of code that elevate all the situation to a ridiculous level. It just characters, it should not be necessary to deal with this confusion.

A friend of mine is joking about this saying that it will be necessary to create a Win32::PtUnicodePoo to help all portuguese perl programmers.

Even so, thank you for your reply.