Compound File Binary format — the legacy container behind .doc/.xls/.ppt and .msi installers.
| 0x00000000 | D0CF11E0A1B11AE1 | ········ | CFB / 'docfile' magic |
The Compound File Binary format is a mini-filesystem inside a single file, used by pre-2007 Office documents (.doc/.xls/.ppt) and Windows Installer packages (.msi). Its eight-byte magic D0 CF 11 E0 A1 B1 1A E1 is a pun on 'docfile'.
Have a file that might be OLE2 / CFB? Identify it with the File Type Identifier — it reads the magic number locally, nothing is uploaded. Or browse all formats.