今見たら
> If any of the elements in separator consists of more than a single character,
> only the first character of that element is considered a delimiter,
> and any subsequent characters are ignored.
> For example, if one of the elements in separator is "10",
> attempting to split the string "This10is10a10string." returns the following four-element array:
> { "This", "0is", "0a", "0string." }.
なんて次の節と矛盾しまくりの記述があって、928さんはMSDNの被害者だったんだ！多分