All, We are getting warnings when trying to compile Boost source files with MSVC 2003 and 2005 when there are high-ASCII characters in the sources. The reported problem only shows up when the computer's region is set to Japanese, but there could be other affected regions as well. A viable workaround is changing the setting for non-Unicode programs in the Control Panel/Regional and Language Options from Japanese to English (United States), but this is very inconvenient for members of our staff whose native region is Japanese. One (abridged) example of the warning we get from MSVC is: While compiling boost\type_traits\is_base_and_derived.hpp: warning C4819: The file contains a character that cannot be represented in the current code page (932). Save the file in Unicode format to prevent data loss. A caveat to this problem is that the warning shows up when there are high-ASCII characters in comments, so all copyright symbols and high-ASCII characters used in names have the potential to generate these compilation warnings for us. Another caveat to this problem is not all high-ASCII characters produce this problem. My guess is that some of the high-ASCII characters have a valid code page translation (e.g., the copyright symbol), and so the warning is not emitted. An implication of this would be that some characters will work for some OS regions and not for others, resulting in a varied set of errors based on the region one has chosen. The reason this is a problem is because our projects have warnings-as-errors turned on. We are not interested in disabling warnings-as-errors to mitigate the issue because of the far-reaching side effects of such a change. Has anyone else seen this problem? Are there other potential fixes other than removing all high-ASCII characters from the source files? Blessings, Foster -- Foster T. Brereton - Computer Scientist Software Technology Lab, Adobe Systems Incorporated fbrereto@adobe.com -- http://opensource.adobe.com