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Microsoft Compound File - Just Solve the File Format Problem

Microsoft Compound File

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(Programs, libraries, and utilities)
(Programs, libraries, and utilities)
Line 79: Line 79:
 
* [http://decalage.info/python/oletools python-oletools - python tools to analyze OLE files]
 
* [http://decalage.info/python/oletools python-oletools - python tools to analyze OLE files]
 
* [https://sourceforge.net/projects/openmcdf/ OpenMCDF]
 
* [https://sourceforge.net/projects/openmcdf/ OpenMCDF]
 +
* [[7-Zip]]
  
 
== Links ==
 
== Links ==

Revision as of 14:20, 19 November 2017

File Format
Name Microsoft Compound File
Ontology
LoCFDD fdd000380, fdd000392
PRONOM fmt/111

Microsoft Compound File is a complex container format used by some versions of Microsoft Office, and other Microsoft applications. It has features similar to those of a filesystem format.

It is also known as Compound File Binary File Format (CFBF or CFB), Microsoft Compound Document File Format, OLE Compound Document Format, OLE2 Compound Document Format, Composite Document File, etc.

The format was not publicly documented by Microsoft until 2008.

It is (or was?) unofficially known as LAOLA File Format.

Contents

Identification

Files begin with signature bytes D0 CF 11 E0 A1 B1 1A E1.

Identifying the specific document type can be difficult. This is one of the few formats for which the file command resorts to a hard-coded identification algorithm (see readcdf.c).

Some, but not all, document types can be identified by the CLSID field in the "root storage" directory entry. This field is usually located at file offset 512×(1 + {the 32-bit integer at offset 48}) + 80.

Some files have a stream named "<U+0005>SummaryInformation" containing metadata, which may include information about the creating application.

Root storage object CLSIDs

The table below lists some of the root storage object CLSIDs that have been observed in this type of file. Use this information at your own risk, as these identifiers can be unreliable.

Microsoft's documentation says this about the CLSID field:

This field contains an object class GUID. [...] If not [all zeroes], the object class GUID can be used as a parameter to start applications.

Although every storage object (think subdirectory) can have a CLSID, this table is only concerned with root storage objects.

Note that the CLSIDs are stored as GUIDs in little-endian binary format, so they have a strange byte order.

Root storage object CLSID Format
{00000000-0000-0000-0000-000000000000} Unspecified (could be AVI, Thumbs.db, ...)
{00020810-0000-0000-c000-000000000046} XLS
{00020820-0000-0000-c000-000000000046} XLS
{00020906-0000-0000-c000-000000000046} DOC
{00020d0b-0000-0000-c000-000000000046} Outlook Item File
{0006f046-0000-0000-c000-000000000046} Outlook Item File
{000c1084-0000-0000-c000-000000000046} MSI
{1cdd8c7b-81c0-45a0-9fed-04143144cc1e} MAX (3ds Max)
{18b8d021-b4fd-11d0-a97e-00a0c905410d} MIX (PhotoDraw)
{56616700-c154-11ce-8553-00aa00a1f95b} FlashPix
{56616800-c154-11ce-8553-00aa00a1f95b} MIX (PhotoDraw) or MIX (Picture It!)
{64818d10-4f9b-11cf-86ea-00aa00b929e8} PPT
{c65e63e1-6c0e-11cf-842e-00aa006130ba} Softimage SCN

Related formats

See Category:Microsoft Compound File.

Specifications

Programs, libraries, and utilities

Links

Editors' notes

TODO: Explain the relationship between Compound File format and the format/technology called COM Structured Storage (or OLE Structured Storage).

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