[boost] [filesystem] Could you only use printable ASCII characters in source file?

While compiling the file path.hpp, VC8, the following line: // ?Copyright Beman Dawes 2002-2005 could generate a warning C4819 (The file contains a character that cannot be represented in the current code page), if Windows is using not English code page. The reason is the ASCII of '?' in above line is 0xA9. My question is, could you use printable characters (Codes 33 to 126) in source file? IMHO, it would be better if you change the line to: // (C)Copyright Beman Dawes 2002-2005 Thanks gchen