Word Document (DOC)

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The Word Document (DOC) file format has the .doc extension. This file type originates from Microsoft Word. However, other word processing software can be used to display these files as well. These include:

The Word DOC file format should not be confused with DOCX.

MIME types

The following MIME types apply to this file format:

  • application/msword
  • application/doc
  • appl/text
  • application/vnd.msword
  • application/vnd.ms-word
  • application/winword
  • application/word
  • application/x-msw6
  • application/x-msword
  • zz-application/zz-winassoc-doc

File signature

Microsoft Word documents of version 97-2003 use the OLE Compound File (OLECF). These files therefore have the OLECF file signature

The object stream of the OLECF containing a Word document contains the string "Word.Document" with some version.

Word 97-2003 documents

The Word Binary File format is stored in the OLECF using multiple streams:

  • WordDocument stream
  • Table stream (0Table, 1Table)
  • Data stream

Encryption

Versions 97/2000 encrypt documents with a very weak algorithm. This password scheme can be broken easily by several different products and it is possible to decrypt the contents without discovering the password. This is done by testing all 1,099,511,627,776 possible keys. Ultimate Zip Cracker by VDGSoftware is one utility that can perform this decryption.

See Also

Word 97-2007 Binary File Format by Microsoft

Extracting Strings

On a unix-like machine try this command to extract strings from a .doc file:

cat /tmp/test.doc | tr -d \\0 | strings | more

(where /tmp/test.doc is the path to your .doc file)