single-byte font and double-byte font

What is the difference between a single-byte font and double-byte font.  
User is receiving the following error message within powerpoint 2003:
You selected a single -byte font to replace a double- byte font. Please select a double-byte font.
They were just changing fonts from one to another in the powerpoint presentation.
Thanks for help on better understanding  these two font types
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for some fonts, each character takes up 1 byte of memory.
Some take 2 bytes ( this we call as unicode support).

Font like Japanese, Chinese take 2 bytes .
Try selecting any uincode option if you have on the PowerPoint for the double byte fonts !

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