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Wed, Jan 31, 2018 11:48 pm

Using olefile to obtain metadata from an OLE CDF V2 file

Microsoft's Object Linking and Embedding (OLE) technology allows embedding and linking to documents and other objects. OLE allows the addition of different kinds of data to a document from different applications, such as a text editor and an image editor. This creates a Compound File Binary Format (CFBF), aka a Compound File, Compound Document format, or Composite Document File V2 (CDF V2) document.

While using my MacBook Pro laptop, which is currently running the OS X El Capitan (10.11.6) operating system, I often need to extract embedded documents from an Excel .xlsm file. I do that by renaming the file to have a .zip rather than a .xlsm file extension. I can then extract the files contained within the .zip file just as I would any zip file. Within the directory structure created by unzipping the zip file there is an xl/embeddings subdirectory with .bin files within it.

$ ls xl/embeddings
Microsoft_Visio_Drawing1.vsdx	oleObject2.bin
Microsoft_Visio_Drawing2.vsdx	oleObject3.bin
oleObject1.bin
$

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