A US install normally doesn't default to a Unicode friendly environment. One of the features of the Scala programming language is that it is completely unicode aware.
See Setup Microsoft Windows for Unicode, to insure your MS Windows installation can properly cope with Unicode characters.
But, to make a USA windows default install of Windows itself, and Eclipse unicode friendly you have to take a few steps.
Lastly to complete the Unicode setup you have to install some updates that allow windows to display certain Unicode characters correctly:
On Linux, UTF-8 and good unicode fonts are the default. Nothing to do here.