Read the number staticItemNo static item from the file.

Reads the next static item. First time called it returns the first static item. If ReadStaticItem(Int32) is called for example with argument staticItemNo 3, the next call to this method will return static item number 4. If one of the methods reading/writing dynamic item data is called, see IDfsFileIO, the static item number is reset, and the next call to this method again returns the first item number.

Write the static item back to the file. the staticItem must originate from this file. This will update and overwrite the static item information and the data of the static item.