That is a type of manifest or metadata file:
http://dicomiseasy.blogspot.com/2013/03/dicomdir-and-media-interchange.html
The app should probably recognize it and ignore it, but if removing the DICOMDIR file makes it work then just do that.
--
Rick Herrick
Sr. Programmer/Analyst
Neuroinformatics Research Group
Washington University School of Medicine
Voice: (314) 273-1645
Web: http://www.xnat.org
Twitter: @NrgXnat
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