The UserEditAtom structure is as follows:
struct PSR_UserEditAtom
{
sint4 lastSlideID; // slideID of last viewed slide
uint4 version; // This is major/minor/build which did the edit
uint4 offsetLastEdit; // File offset of last edit
uint4 offsetPersistDirectory; // Offset to PersistPtrs for this edit.
uint4 documentRef; // reference to document atom
uint4 maxPersistWritten; // Addr of last persist ref written to the file (max seen so far).
sint2 lastViewType; // enum view type
};