Microsoft Office 'old' format file extension list

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Here’s the full list of file extensions for the older Office document formats.

We’ve talked about the risks of receiving hacked documents using the older Microsoft Office document formats.  Hackers generally use the common .doc .xls or .ppt documents but there are others.   Bad documents are sometimes put inside .zip files or fake .zip’s.

To the human eye, it’s easy to tell old and new formats apart.  All the older formats have 3 letter extensions (.doc) while the new formats have 4 letter extensions (.docx).  Access 2007 and later use 5 letter extensions (.accdb etc).

Use this list if you’re making Outlook Rules or VBA to check for attachments using the older formats.

Word

.doc

.dot

.rtf  isn’t just an Office document format but it was widely used in past decades.  It also can be used to run nasty code on your computer and should be treated with caution.

Excel

.xls

.xlt

.xlm

.xla

.xll

.xlw

PowerPoint

.ppt

.pot

.pps

Access

.mdb

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