These files are written by Yubico and are provided here with their permission.
The latest version of the files may be downloaded from:
http://static.yubico.com/var/uploads/files/YubikeyLib.zip
Notes:
1. The the Windows driver development kit needs to be installed in order to compile this library.
2. To get this to compile, I had to remove sal.h from the DDK as described in
http://stackoverflow.com/questions/1356653/multiple-compiling-errors-with-basic-c-application-on-vs2010-beta-1/2312570#2312570

