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There's a file called MM! in every directory in DOS 6.22. Just MM!, no file extension... What causes this?

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  • 5
    I'll take "Computer Viruses" for $200, Alex.
    – msw
    Jul 5, 2010 at 23:23
  • I agree with msw here. There is no documented reason for this behaviour.
    – Breakthrough
    Feb 22, 2011 at 21:18
  • I didn't know DOS 6.22 even existed any more.
    – HK1
    Mar 3, 2011 at 21:34
  • HK1: Most people have upgraded to FreeDOS: freedos.org
    – Randolf Richardson
    Mar 6, 2011 at 17:53
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    Can you examine the contents of one of these MM! files?
    – Majenko
    Mar 13, 2011 at 12:48

1 Answer 1

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If your DOS 6.22 system has network file-sharing enabled and it's file-shares are accessed from a Windows system that is running some file management/cataloging software, it is possible the software creates the "MM!" files to keep track of some metadata such as the archiving policies for each folder or a history of actions taken.

This is pure speculation based on Googling for "MM file", noting certain interesting results and thinking about the way products like Picasa (not the culprit) create metatdata files in each folder.

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