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What software created them?
Maybe Microsoft Excel can open them.
UDF File Extension
http://www.fileinfo.com/extension/udf
File Extension UDF
http://filext.com/file-extension/UDF
--
J. Inzer MS-MVP
Digital Media Experience
Notice
This is not tech support
I am a volunteer
Solutions that work for
me may not work for you
Proceed at your own risk