为什么win32 API函数没有重载，而是使用Ex作为后缀？

The win32 API has for example two methods StrFormatByteSize and StrFormatByteSizeEx. Even though both the methods symantically do the same thing and the Ex counter part only offers a new parameter to slightly change the behavior then couldn't they have two overloads of the same function?The win32 API has for example two methods StrFo