Microsoft Office Binary (doc, xls, ppt) File Formats
Sounds crazy but I got and unavoidable curiosity to look at these documents.
“sprmCPicLocation (opcode 0x6A03) is used ONLY IN CHPX FKPs. This sprm moves the 4-byte operand of the sprm into the chp.fcPic field. It simultaneously sets chp.fSpec to 1. This sprm is also used when the chp.lTagObj field that is unioned with chp.fcPic is to be set for OLE objects.”