Demon

if在内部是使用lstrcmpW函数来比较字符串是否相等的（详见《批处理技术内幕：IF命令》）

lstrcmp函数的文档中有那么一段：

The lstrcmp function uses a word sort, rather than a string sort. A word sort treats hyphens and apostrophes differently than it treats other symbols that are not alphanumeric, in order to ensure that words such as "coop" and "co-op" stay together within a sorted list. For a detailed discussion of word sorts and string sorts, see the Remarks section for the CompareString function.

连字符（hyphen）和撇号（apostrophe）会被区别对待。