[Description] Applies to Windows 2000 and Windows XP only: Ignores the ampersand (&) prefix character in the text. The letter that follows will not be underlined, but other mnemonic-prefix characters are still processed. For example, an input string of "A&bc&&d" with HidePrefix applied would result in output of "Abc&d". Compare with NoPrefix and PrefixOnly. [Member name] 
HidePrefix