2.1.1.2 Stream Storage Signature

The stream storage signature indicates to the system that the file is a valid Spreadsheet Data Model file. The stream storage signature is a byte stream. The stream storage signature MUST come directly after the byte order mark and directly before the rest of the header without any breaks.

The stream storage signature MUST be set to the following ASCII string:

 STREAM_STORAGE_SIGNATURE_)!@#$%^&*(

The stream storage signature MUST be encoded in Unicode.