Every now and then I receive attachments from Windows users that show up as "Picture (Device independent Bitmap)" and - when I run "file" on the command line, they are identified as "Composite Document File V2 Document".

I guess they are screenshots - what would be the best way to view them on a Mac?


  • When you Control-Click on the item, what shows up in the Open With menu? Preview? How about Safari? Device Independent Bitmaps are BMPs, a common Windows picture format. You might even be able to view them with QuickLook.
    – Zo219
    Commented Mar 20, 2013 at 1:52
  • I get preview as the default application, and then an error message that says: "The file “foo.bmp” could not be opened. It may be damaged or use a file format that Preview doesn’t recognize"
    – simone
    Commented Mar 20, 2013 at 5:58

1 Answer 1


Based on the output from file I'd suggest that you try unoconv to convert it to something your system can open.

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