The XLL+ run-time classes use three types of string:

1. Strings that are always ANSI (8-bit).
2. Strings that are always Unicode (16-bit).
3. Strings that are portable and may be ANSI or Unicode depending on whether _UNICODE is #defined.

Wide strings

The XLL+ classes use exclusively Unicode (or wide) strings in various places where it is necessary in order to properly support Excel 2007.

Uses of wide strings include:

• Exported names of functions
• Error messages
• Argument names and descriptions under Excel 2007

In these cases, if you try to use standard strings or fail to apply the L prefix to literals you will receive a compiler error.

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