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in Visual C++ in Debug mode. The isprint, isalpha, etc. functions from ctype.h have an assertion that the value of the character passed in is <= 255. If you pass a character whose value is >= 128, it is cast to an unsigned int, making it a large positive number and failing the assertion. This is the same thing that was reported in http://seclists.org/nmap-dev/2007/q2/0257.html, in regard to non-ASCII characters in nmap-mac-prefixes.
Here is some documentation for Nmap, but these files are much less comprehensive than what you'll find at the actual Nmap documentation site ( http://nmap.org ).