Asc( string )
The range for returns is 0 – 255 on non-DBCS systems, but –32768 – 32767 on DBCS systems.
The AscB function is used with byte data contained in a string. Instead of returning the character code for the first character, AscB returns the first byte. The AscW function returns the Unicode character code except on platforms where Unicode is not supported, in which case, the behavior is identical to the Asc function.
Visual Basic for the Macintosh does not support Unicode strings. Therefore, AscW(n) cannot return all Unicode characters for n values in the range of 128 – 65,535, as it does in the Windows environment. Instead, AscW(n) attempts a "best guess" for Unicode values n greater than 127. Therefore, you should not use AscW in the Macintosh environment.