---
type: lookup
id: doc-xls-ppt-msi-msg-d0-cf-11-e0-a1-b1-1a-e1
asset: file-format-signatures
title: "D0 CF 11 E0 A1 B1 1A E1 — File format magic numbers"
sources:
  - https://en.wikipedia.org/wiki/List_of_file_signatures
source_quote: "doc xls ppt msi msg | <https://en.wikipedia.org/wiki/Compound_File_Binary_Format> Compound File Binary Format , a container format defined by Microsoft COM. It can contain the equivalent of files and directories. It is used by <https://en.wikipedia.org/wiki/Windows_Installer> Windows Installer and for documents in older versions of <https://en.wikipedia.org/wiki/Microsoft_Office> Microsoft Office . [ 44 ] It can be used by other programs as well that rely on the COM and OLE API's. ( 0xD0CF11E0 visually resembles \"DOCFILE\". [ 45 ] )"
generated: true
verified: false
harvested: 2026-08-03
stale_after: 2027-08-03
hex_signature: "D0 CF 11 E0 A1 B1 1A E1"
offset: "0"
extension: "doc xls ppt msi msg"
format: "Compound File Binary Format , a container format defined by Microsoft COM. It can contain the equivalent of files and directories. It is used by <https://en.wikipedia.org/wiki/Windows_Installer> Windows Installer and for documents in older versions of <https://en.wikipedia.org/wiki/Microsoft_Office> Microsoft Office . [ 44 ] It can be used by other programs as well that rely on the COM and OLE API's. ( 0xD0CF11E0 visually resembles \"DOCFILE\". [ 45 ] )"
unverified_fields: hex_signature, offset
---
**Hex signature:** D0 CF 11 E0 A1 B1 1A E1

**Offset:** 0

**Extension:** doc xls ppt msi msg

**Format:** Compound File Binary Format , a container format defined by Microsoft COM. It can contain the equivalent of files and directories. It is used by <https://en.wikipedia.org/wiki/Windows_Installer> Windows Installer and for documents in older versions of <https://en.wikipedia.org/wiki/Microsoft_Office> Microsoft Office . [ 44 ] It can be used by other programs as well that rely on the COM and OLE API's. ( 0xD0CF11E0 visually resembles "DOCFILE". [ 45 ] )

> doc xls ppt msi msg | <https://en.wikipedia.org/wiki/Compound_File_Binary_Format> Compound File Binary Format , a container format defined by Microsoft COM. It can contain the equivalent of files and directories. It is used by <https://en.wikipedia.org/wiki/Windows_Installer> Windows Installer and for documents in older versions of <https://en.wikipedia.org/wiki/Microsoft_Office> Microsoft Office . [ 44 ] It can be used by other programs as well that rely on the COM and OLE API's. ( 0xD0CF11E0 visually resembles "DOCFILE". [ 45 ] )

Source: <https://en.wikipedia.org/wiki/List_of_file_signatures>