So it looks like you're going to have to download it as put it somewhere that your compiler can find it. From the comments in the header, it seems it simply does mapping between latin1 and dos character sets.
Okay. I just wanted to be able to use the whole Swedish alphabet, because whenever I try to use Å, Ä or Ö it outputs some other weird sign. Maybe there is some other way to include those letters without having to write a number combination each time?