https://bugzilla.wikimedia.org/show_bug.cgi?id=24073

--- Comment #10 from Derk-Jan Hartman <[email protected]> 2010-06-23 
22:32:17 CEST ---
Platonides is right. Basically, 2007 saves a .doc file, but appends a .zip with
OPC index to it.

I'll add a check for this, by scanning for the magic bytes of older MS Office
documents in some way.

http://www.garykessler.net/library/file_sigs.html
MSOffice header: D0 CF 11 E0 A1 B1 1A E1

Office subheaders at bytepos 512

EC A5 C1 00         [512 byte offset]
DOC         Word document subheader (MS Office)

FD FF FF FF nn 00 00 00         [512 byte offset]
PPT         PowerPoint presentation subheader (MS Office)
(where nn has been seen with values 0x0E, 0x1C, and 0x43)

FD FF FF FF nn 00         [512 byte offset] or
FD FF FF FF nn 02         [512 byte offset]
XLS         Excel spreadsheet subheader (MS Office)
(where nn = 0x10, 0x1F, 0x22, 0x23, 0x28, or 0x29)

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