INTERFACEHDR: Beginning of User Interface Records (E1h)

This record marks the beginning of the user interface section of the Book (Workbook) stream. In BIFF7 and earlier, it has no record data field. In BIFF8 and later, the INTERFACEHDR record data field contains a 2-byte word that is the code page. This is exactly the same as the cv field of the the CODEPAGE record.

Record Data — BIFF8

Offset	Name	Size	Contents

4	cv	2	Code page the file is saved in: 01B5h (437 dec.) = IBM PC (Multiplan) 8000h (32768 dec.) = Apple Macintosh 04E4h (1252 dec.) = ANSI (Microsoft Windows)